On RTL8710BX OTA updates start failing after 40-50 successful ones with message: ERROR Error receiving acknowledge Update end: timed out about libretiny HOT 6 CLOSED

There is a 32-bit counter which indicates which firmware (1/2) to use. It's 0xFFFFFFFF by default, and each OTA attempt clears one bit from the number. Just like I thought, the mechanism of OTA switching is broken and doesn't know what to do when the counter reaches 0.

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In order for me to check what's wrong, do this:

• make a full dump of the device in a state of "broken" OTA updating
• -> install ltchiptool and run ltchiptool flash read ambz dump_file.bin
• post the dump here, along with an UF2 file causing that failure

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The archive contains a dump and the first uf2 which failed. The last working uf2 is not available because it was overwritten by the compilation process.
libretuya.zip
This issue has always happened on this device, independent of compiling on my workstation or the Libretuya ESPhome HA Add-on.

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I forgot to mention that I also have to flash a dump of the original ezviz firmware before OTA updates start working again.
I'm attaching again the 3 dumps I have. I'm usually flashing "dump_ezviz_3.bin".
ezviz dumps.zip

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@mihsu81
Should be fixed in 4b25ef7 🎉
(note that you need to upload the fix first, after that OTA will work correctly)

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@kuba2k2 Flashed the original dump after which I flashed my latest uf2 for that device over UART.
I've also did a couple of OTA updates which went well.
Now only time will tell if the issue is fixed. I'll reopen the issue if something goes wrong.

Thank you again for your help.

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