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Originally Posted by t1ao
Alright, I'm new to EcuFlash and looking for a little help. I have read through tons and tons of posts and tutorials. Spent hours reading, but i'm not 100% sure and just want some clarification.
So i have a tactrix cable, a 2012 frs, the beta ecu flash installed, and i downloaded all the definition files.
This seems like a stupid question even to me, i think i already know the answer to it, i want to re-flash with a OTS Map, do i need to use the same ecu? Say i have ZA1JA01C.bin do I have to use a modified ZA1JA01C.bin or can i used a ZA1JB01C.bin already tuned? And would I be able to go back to the stock bin? It seems like i can but it seems like no one says yes specifically. More so, could i flash any FRS Rom on to my FRS as long as it is MT and US?
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You can use an 01c ROM already tuned, and any other ROM in that family of US manual roms. You can also tune your own, but there's nothing special about it. I'd use the most recent OTS/OFT tune of the most recent US manual ROM. So basically, the answer to your question is YES.
The only thing I do for safety is make sure that I can read the ROM before I write a new one. This just makes sure that the connection is secure. A couple of times, I had a bad connection and the read failed. Would have been bad during a write.