Hello, I have a situation that I have been dealing with for a long time and I can't solve it and I finally decided to ask here.
First of all, I am trying to update nextion with Esp32 wrover and I have no problem, then I updated it with an encrypted file in Aes-256 format and again I had no problem. Now I decrypt every 4096 byte packet to be sent just before it is sent. The decrypted packets reach the destination correctly. At the end of the update, if I am not mistaken, nextion does a crc check and at that point I get a check error. And I have no idea how to solve it. I am also using whmi-wris command.
I know nothing about the part but it sounds like you are missing part of the protocol or calculating the crc incorrectly. For it to check the crc you need to tell it what it is, that is part of the protocol. You send 4096 bytes but I do not think that is the complete package.
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