Firmware EG25-G

IoT Modules LTE Standard Module
1

I am using an EG25-G module with firmware EG25GGBR07A08M2G_A0.204.A0.204.

Issue description:

I have enabled UAC (USB Audio Class) using the following AT command sequence, based on Quectel documentation and forum guidance:

text

AT+QCFG="usbcfg",0x2C7C,0x0125,1,1,1,1,1,0,1
AT+QPCMV=1,2
AT+QAUDMOD=3
AT&W

After a physical power cycle, the audio interface is detected correctly in Linux:

text

card 2: EG25G [EG25-G], device 0: USB Audio [USB Audio]

AT+QPCMV? returns +QPCMV: 1,2, and AT+QAUDMOD? returns +QAUDMOD: 3. All audio-related configuration appears correct.

However, two critical problems occur:

  1. No audio is transferred between Linux and the active call.

    • aplay -D plughw:2,0 file.wav completes without errors.

    • arecord -D plughw:2,0 records 2 seconds of audio, but the resulting file contains only silence (Maximum amplitude: 0.000000).

    • During an active call, no audio is heard in either direction.

  2. Calls get stuck in NVRAM (“ghost call”).

    • After a call ends (either answered or not answered), AT+CLCC continues to report an active call:
      +CLCC: 1,1,0,1,0,"",128

    • AT+CHUP returns OK but does not clear the state.

    • AT+CFUN=1,1 (soft reset) does not clear the state.

    • The only way to recover is a full physical power cycle (disconnecting USB and power).

    • Until the power cycle, subsequent outgoing calls fail or behave unpredictably.

Request:

Could you please provide the latest firmware for this module — preferably EG25GGBR07A08M2G_A0.304.A0.304 or any newer revision that addresses UAC audio routing and call-state lockup on the EG25-G?

Please also include the appropriate flashing tool (QFlash / QFirehose) and any required documentation for the update procedure.

Module details:

  • Module: Quectel EG25-G

  • Current firmware: EG25GGBR07A08M2G_A0.204.A0.204

  • USB VID/PID: 2c7c:0125

  • Host: Debian Linux, kernel supports UAC

  • Use case: Outgoing voice calls with audio playback (TTS) and SMS via AT commands

2

for EG25GGBR07A08M2G is A0.304.A0.304 still the latest firmware? if released a new one can you provide me? im stilll on A0.304.A0.304

3

Dear Customer,

I have sent you the latest firmware through email. Please check there.

4

i didnt receive your email @fazrulredzuan

5

Dear Customer,

I mean I sent the firmware to the other customer since your current firmware version is the latest version that we have now.

6

Can you please also provide Qfirehose so i can upgrade?

7

Dear Customer,

I have sent through your email. Please check there.

8

Thank you, but firmware update does not work!!

Why the firmware update failed:

  1. Fastboot, not EDL: AT+QFASTBOOT correctly put the modem into fastboot mode, but this is not the same as EDL (Emergency Download) mode. Fastboot is meant for flashing individual partitions, not a full firmware upgrade.

  2. Wrong tools for the job: Commands like AT+QDOWNLOAD=1 and AT+QCFG="fastboot/debug",1 are either obsolete or not supported on this modem. fastboot reboot-edl is not a valid command on the modem’s bootloader.

  3. EDL requires physical access: To force the EG25-G into EDL mode, you must short pin 115 (USB_BOOT) to 1.8V during power-up. Without physical access to that pin, there is no software-only way to enter EDL.

  4. Fastboot flashing is incomplete and risky: Flashing via fastboot only updates a few partitions (system, boot, aboot) and skips critical ones like modem, modemst1/2, and fsg/fsc. This can cause IMEI loss, bootloops, or network failure.

  5. Result: The firmware update could not be completed because the required EDL mode was unreachable, and the available fastboot method was too risky to use

9 
I am writing to request a DFOTA (Delta Firmware Over The Air) delta package for my Quectel EG25-G module.

Current firmware version:
EG25GGBR07A08M2G_A0.204.A0.204

Target firmware version:
EG25GGBR07A08M2G_A0.304.A0.304

I am experiencing known issues with UAC (USB Audio Class) and call state lockup on firmware A0.204, and I understand that A0.304 resolves these issues.

I would like to perform the upgrade via DFOTA using the AT+QFOTADL command. Please provide:

1. The DFOTA delta package (zip file) for upgrading from A0.204 to A0.304
2. The DFOTA User Guide for EG25-G
3. Any specific instructions or prerequisites for this upgrade path

Module details:
- Model: EG25-G
- Current firmware: EG25GGBR07A08M2G_A0.204.A0.204
- Target firmware: EG25GGBR07A08M2G_A0.304.A0.304
- Interface: USB (Linux host)
- Use case: Voice calls via USB Audio (UAC) with Asterisk/Piper TTS

Thank you for your assistance.