@AF-Domains.net
The A600 and A500plus (I think) use the 2.04 ROMS
there is absolutely no reason on earth..........not a single one, for you to use 1.4 ROMS.............maybe 1.3 ROMS yes.
What you really want is a Kickstart switcher with both KS 1.3 and KS 3.1 plugged in.