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I seem to recall that the limit to the number of times a ECU can be flashed came from the Renasis technical manual for the ECU that is fitted to the Hayabusa, Subaru, etc. I think it said that's how many times they were willing to guarantee it for. That being said, I think it's bullshit. I treat mine like a USB stick, it's been flashed well over two hundred times with no ill effects. Others have flashed individual ECUs over a thousand times.
Okay, I've done a bit of research, it came from the Renasis data sheet according to Marlin Bially, AKA RidgeRacer, one of the founding fathers of ECU Editor; Renesas specifies that any block of flash will survive a MINIMUM of 100 flash writes and that there has to be a data retention life (usually minimum 10 years/100,000 miles). I quote: "It is a guaranteed minimum number of times you can flip individual bits from 1 to 0 or 0 to 1. BTW When you erase your flash all the bits are set to 1. If they were already 1 then that doesn't count as a flip. If you reprogram it to a 1 that doesn't count either.
But its a guaranteed minimum not a maximum. Doesn't mean at 101 cycles its toast, it just means don't go crying to [the manufacturer] if your data gets corrupted". Woopee, I doubt if anyone out there has flashed their ECU to death yet. I can't find any genuine cases.
Okay, I've done a bit of research, it came from the Renasis data sheet according to Marlin Bially, AKA RidgeRacer, one of the founding fathers of ECU Editor; Renesas specifies that any block of flash will survive a MINIMUM of 100 flash writes and that there has to be a data retention life (usually minimum 10 years/100,000 miles). I quote: "It is a guaranteed minimum number of times you can flip individual bits from 1 to 0 or 0 to 1. BTW When you erase your flash all the bits are set to 1. If they were already 1 then that doesn't count as a flip. If you reprogram it to a 1 that doesn't count either.
But its a guaranteed minimum not a maximum. Doesn't mean at 101 cycles its toast, it just means don't go crying to [the manufacturer] if your data gets corrupted". Woopee, I doubt if anyone out there has flashed their ECU to death yet. I can't find any genuine cases.