@jyijyi Thanks, I was able to successfully update the modem firmware using the AT commands. Below are a few observations that were not mentioned in the datasheet, or that I discovered during the process:
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AT+KSLEEP=0 — Sleep mode must be disabled; otherwise, the file transfer will not work.
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AT+WDSI=4095 — This enables all notifications.
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After the file transfer, I did not receive the expected +WDSI: 3. I manually issued AT+WDSR=4 and waited until +WDSI: 16 appeared.
This topic was helpful → HL7688 Firmware Archive
However, I only see the firmware version RHL7688.A.2.15.1.0.151600.201809181425.x71601signed_DWL.dwl available for download(Already my current version). Are there other versions I can test—for example, to perform upgrade/downgrade validation?
The available file is quite large (~20 MB) and takes a long time to transfer over UART. Are delta-update files available instead? If so:
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Where can I obtain them?
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How should they be flashed onto the modem?