# LTE EC25 series ## Key features - Supports DFOTA - Supports DTMF - Supports MIMO - Supports VoLTE (optional) - Multi-constellation GNSS receiver available ## Overview Quectel EC25 is a series of LTE Cat 4 modules optimized specially for M2M and IoT applications. Adopting the 3GPP Rel-11 LTE technology, it delivers maximum data rates up to 150 Mbps downlink and 50 Mbps uplink. Designed in the compact and unified form factor, EC25 series is compatible with Quectel multi-mode LTE Standard EC21 series/EC20-CE/EG25-G/EG21-G modules and UMTS/HSPA+ UC200A-GL module, which allows for flexible migration among them in design and manufacturing. EC25 series contains 14 variants: EC25-A, EC25-ADL, EC25-V, EC25-AF, EC25-AFDL (Data-only), EC25-AFX, EC25-AFXD (Data-only), EC25-AU, EC25-AUX, EC25-J, EC25-EU, EC25-EUX, EC25-E and EC25-EM. This makes it backward-compatible with existing EDGE and GSM/GPRS networks, ensuring that it can be connected even in remote areas devoid of 4G or 3G coverage. EC25 series supports Qualcomm® IZat™ location technology Gen8C Lite (GPS, GLONASS, BDS, Galileo and QZSS). The integrated GNSS greatly simplifies product design, and provides quicker, more accurate and more dependable positioning. A rich set of Internet protocols, industry-standard interfaces and abundant functionalities (USB serial drivers for Windows 10/11, Linux, Android) extend the applicability of the module to a wide range of M2M and IoT applications such as industrial routers, industrial PDAs, video transmission, rugged tablet PCs, and digital signage. Browse our wide range of antennas – download our antenna brochure [View brochure](https://www2.quectel.com/quectel_antenna_brochure.pdf) ## Product Brochure Quectel_Product_Brochure_V8.6.pdf [Download](https://www.quectel.com/content/uploads/2026/05/Quectel_Product_Brochure_V8.6.pdf) ## Documentation and resources - **Application Note** - **Quectel_WCDMA&LTE_Audio_Design_Note_V1.1** File Size: 1.96 MB [Login](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) - **Quectel_EC2x&EG2x&EG9x&EM05_Series_eSIM_LPA_Application_Note_V1.0** File Size: 402.29 KB [Login](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) - **Quectel_EC2x_Series&EG25-G_SGMII_Application_Note_V1.0** File Size: 133.84 KB [Login](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) - **Quectel_EC2x&EG2x&EG9x&EM05_Series_QuecCell_Application_Note_V1.2** File Size: 261.36 KB [Login](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) - **Quectel_EC2x&EG2x&EG9x&EM05_Series_Secure_DFOTA_Mechanism_Introduction_V1.0** File Size: 276.92 KB [Login](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_RF_FTM_Application_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 347.27 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Data_Call_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 3.43 MB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_DFOTA_Upgrade_Guide_V1.4](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 234.42 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_MQTT_Application_Note_V1.5](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 300.36 KB ## [Quectel_EG25-G&EC2x_Series_Bluetooth_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 339.22 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Network_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 414.15 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Low_Power_Mode_Application_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 268.41 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_LwM2M_Application_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 247.50 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Power_Back-off_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 273.94 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Secure_Boot_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 590.85 KB ## [Quectel_EC2x&EG9x&EG2x-G_Series_Software_Configuration_For_AT&T_Data-Only_Guide_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 205.74 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_PPP_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.29 MB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Security_Feature_Application_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 188.90 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_Terminal_Device_Development_Notes_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 152.95 KB ## [Quectel_EC2x&EG9x&EG2x-G_Series_Software_Configuration_for_AT&T_3G_Sunset_Guide_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 230.47 KB ## [Quectel_EC25-J_SoftBank_AutoFOTA_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 302.50 KB ## [Quectel_EC2x&EG9x&EG2x-G&EM05_Series_IMS_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 531.00 KB ## [Quectel_EC2x_Series&EG25-G_Socket_Forwarding_Application_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 300.04 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_TCP(IP)_Application_Note_V1.7](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 451.33 KB ## [Quectel_EC2x&EG9x&EG2x-G&EM05_Series_MMS_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 256.46 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_FILE_Application_Note_V1.3](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 313.08 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_USB_Descriptor_Introduction_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 276.29 KB ## [Quectel_EC2x&EG9x&EG2x-G&EM05_Series_HTTP(S)_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 465.13 KB ## [Quectel_LTE_Standard_UAC_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 324.21 KB ## [Quectel_EC2x_Series&EG25-G_Wi-Fi_Application_Note_V1.5](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 416.43 KB ## [Quectel_EC2x&EG9x_TTS_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 285.79 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_FTP(S)_Application_Note_V1.3](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 365.99 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_SSL_Application_Note_V1.3](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 278.29 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_GNSS_Application_Note_V1.6](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 526.16 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_SMTP_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 240.54 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_QSIMCFG_AT_Commands_Manual_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 243.48 KB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_AT_Commands_Manual_V2.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.64 MB ## [Quectel_EC2x&EG2x&EG9x&EM05_Series_QCFG_AT_Commands_Manual_V1.6](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 747.73 KB ## [EC2x&EG9x_AWS_IoT_Platform_Access_Guide](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.20 MB ## [Quectel_Windows_USB_Driver(Q)_ECM_V1.1_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 17.27 MB ## [Quectel_Android_RIL_Driver_radio1.5_OemHook_V4.0_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 2.37 MB ## [Quectel_Android_RIL_Driver_aidl2_V4.7_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 2.01 MB ## [Quectel_Linux_USB_Serial_Option_Driver_V1.1_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 27.47 MB ## [Quectel_Android_RIL_Driver_radio1.4_V4.0_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 2.30 MB ## [Quectel_Android_RIL_Driver_radio1.5_V4.0_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 2.36 MB ## [Quectel_Android_RIL_Driver_ndk_V4.0_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.62 MB ## [Quectel_Android_RIL_Driver_radio1.6_V4.5_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 2.39 MB ## [Quectel_Linux_Android_QMI_WWAN_Driver_V1.3_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.26 MB ## [Quectel_Android_RIL_Driver_aidl3_V4.7_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.75 MB ## [Quectel_Android_RIL_Driver_aidl1_V4.7_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.68 MB ## [Quectel_Windows_USB_Driver(Q)_NDIS_V2.8_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 9.92 MB ## [Quectel_UC20&UC15&EC20&EC21&EC25_Windows_USB_Drivers_Installation_Guide_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 2.11 MB ## [Quectel_EC2x&EG2x-G_Compatible_Footprint&Part_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 133.23 KB ## [Quectel_EC2x&EG2x&RG255C_Series_Compatible_Design_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 634.35 KB ## [Quectel_EC25_Footprint&Part_20180511](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 72.87 KB ## Quectel_EC25_Series_2D_Dimensions_V1.1 File Size 190.05 KB ## Quectel_EC25_Series_3D_Dimensions_V1.1 File Size 911.39 KB ## Quectel_EC25_Series_Reference_Design_V1.9 File Size 585.48 KB ## Quectel_EC200x&EC2x_Series_Compatible_Design_V1.0 File Size 769.37 KB ## Quectel_EC200A&EC2x_Series_Compatible_Design_V1.0 File Size 890.80 KB ## Quectel_EC2x&EG2x_Series_PCB_Design_Guide_V1.3 File Size 5.45 MB ## Quectel_EC2x&EG2x-G&UC200T_Series_Compatible_Design_V1.2 File Size 1.19 MB ## Quectel_EC25_Series_Hardware_Design_V2.8 File Size 2.25 MB ## ToolKit ### [QFlash_V8.0_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 326.70 MB ### [QMulti_DL_CMD_V4.4_EN](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 178.96 MB ### [Quectel_EC25&EC21&EC20 R2.0_QFlash_Linux&Android_User_Guide_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 793.37 KB ## User Guide ### [Quectel_EC25-J_Software_Configuration_Guide_for_NTT_DOCOMO_3G_Sunset_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 149.47 KB ### [Quectel_EC2x&EG2x&EG9x&EM05_Series_Software_Thermal_Management_Guide_V2.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 213.01 KB ### [Quectel_Antenna_Design_Note_V3.4](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) File Size 1.14 MB ## Related products ### [LTE OPEN EVB kit](https://www.quectel.com/product/lte-open-evb-kit/) ![LTE OPEN EVB kit](https://www.quectel.com/content/uploads/2021/10/20180926100113803.png) [Read more: LTE OPEN EVB kit](https://www.quectel.com/product/lte-open-evb-kit/) ### [UMTS & LTE EVB kit](https://www.quectel.com/product/umts-lte-evb-kit/) ![UMTS & LTE EVB kit](https://www.quectel.com/content/uploads/2021/10/20170413143548112.png) [Read more: UMTS & LTE EVB kit](https://www.quectel.com/product/umts-lte-evb-kit/) ### [YF0028AA 4G adhesive mount FPC + cable dipole embedded antenna](https://www.quectel.com/product/yf0028aa-4g-adhesive-mount-antenna/) ![YF0028AA 4G adhesive mount FPC + cable dipole embedded antenna](https://www.quectel.com/content/uploads/2024/09/YF0028AA-side-view-e1727191903574.png) [Read more: YF0028AA 4G adhesive mount FPC + cable dipole embedded antenna](https://www.quectel.com/product/yf0028aa-4g-adhesive-mount-antenna/) ### [YEGB000Q1C GNSS L1 adhesive + magnetic mount low profile active external antenna](https://www.quectel.com/product/yegb000q1c-active-gnss-magnetic-adhesive-antenna/) ![YEGB000Q1C GNSS L1 adhesive + magnetic mount low profile active external antenna](https://www.quectel.com/content/uploads/2024/09/YEGB000Q1C-side-view-e1727168513857.png) [Read more: YEGB000Q1C GNSS L1 adhesive + magnetic mount low profile active external antenna](https://www.quectel.com/product/yegb000q1c-active-gnss-magnetic-adhesive-antenna/) ## Customer device profiles ### Outdoor FWA modem ![ELSYS](https://www.quectel.com/content/uploads/2022/09/Amplimax-from-Elsys-for-the-text-in-the-website-1024x406.jpg) ![ELSYS](https://www.quectel.com/content/uploads/2025/05/elsys-logo.png) ### Smart street lighting ![Greenapsis](https://www.quectel.com/content/uploads/2025/05/greenapsis-smart-lighting-1024x683.jpg) ![Greenapsis](https://www.quectel.com/content/uploads/2025/05/logo_greenapsis.png) ### Motorcycle telematics unit ![GEN motorcycles](https://www.quectel.com/content/uploads/2024/03/electric-motorbike-1024x620.jpg) ![GEN motorcycles](https://www.quectel.com/content/uploads/2025/05/FIX-LOGO-SAVART-23092022-3.webp) ### Radio access terminal ![Furukawa Electric](https://www.quectel.com/content/uploads/2021/10/customer-stories-furukawa-chooses-quectel-lte-and-nb-iot-modules-for-agribusiness-and-utilities-customers-in-brazi-1024x352.png) ![Furukawa Electric](https://www.quectel.com/content/uploads/2025/05/furukawa-electric.png) ### Smart POS ![CHD Asia Pte. Ltd.](https://www.quectel.com/content/uploads/2025/05/CHD_Asia_PTE_Ltd_unit.jpg) ![CHD Asia Pte. Ltd.](https://www.quectel.com/content/uploads/2025/05/CHD_Asia_PTE_Ltd_logo.png) - [Quectel_WCDMA<E_Audio_Design_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 1.96 MB - [Quectel_EC2x&EG2x&EG9x&EM05_Series_eSIM_LPA_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 402.29 KB - [Quectel_EC2x_Series&EG25-G_SGMII_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 133.84 KB - [Quectel_EC2x&EG2x&EG9x&EM05_Series_QuecCell_Application_Note_V1.2](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 261.36 KB - [Quectel_EC2x&EG2x&EG9x&EM05_Series_Secure_DFOTA_Mechanism_Introduction_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 276.92 KB - [Quectel_EC2x&EG2x&EG9x_Series_Power_Back-off_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 273.94 KB - [Quectel_EC2x&EG2x&EG9x_Series_Secure_Boot_Application_Note_V1.0](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 590.85 KB - [Quectel_EC2x&EG2x&EG9x_Series_Security_Feature_Application_Note_V1.1](https://www.quectel.com/login/?redirect=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Flte-ec25-series%2F) — File Size: 188.90 KB ## Also of interest - [LTE EC25 Mini PCIe series](https://www.quectel.com/product/lte-ec25-mini-pcie-series/) - [LTE EG25-G](https://www.quectel.com/product/lte-eg25-g/) - [Quectel EC25 firmware](https://forums.quectel.com/t/quectel-ec25-firmware/48412)