Downgrade FX30s catm from R15 to R9


Is it possible to downgrade a FX30 flashed with R15 fx30_catm release to older release R9 for e.g ?

What are the steps to do this ?

why do you need to do this?

Please see here where @cchenry says it is not recommended:

I tried it and I am having trouble with Airvantage. It connects but I cannot send any updates or synchronize now. I did the flash_erase and trying it to see if it works properly

For others who faces the same issue, updating it to R9 and then back to R14.1 worked for me with flash_erase.