Can i un-UpRev?

Abdiel

i doubt they would check unless asked by nissan.

for example, say your uprev tune increases the rev limiter by 500 and then the engine is damaged when the new increased rev limit is reached. you reflash back to stock and take it in. dealership finds nothing out of the ordinary but nissan asks for an ecu dump for failure analysis. if this ecu flashed count is kept, they can match the reported number to your service history. a mismatch would then be considered a red flag.