ATTiny402 Exception: Timeout waiting for flash ready after page write about pyupdi HOT 4 CLOSED

ATtiny402 has 4K FLASH.
Your hexfile has 3317 bytes (ok) but it has an offset of 0x2000:
"Loaded 3317 bytes from ihex starting at address 0x2000"
This puts it outside the range for this part.
Where did you get this hexfile from? Or is there some custom linker or post-build which adds this offset?

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Atmel Studio 7.0, thought that was a bit off as well, thought the offset was coming form this software,
I was able to get other smaller hex-files working. though this was the only C++ hexfile vs others that where just C.

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Strange. Any chance you could share the project, or a minimal setup which has the same mystery-offset?

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i think it was the project. others are working, sorry i did not debug more on my end first :(

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