well last night i've tried the lurker rom too, their latest, before i roll it back to the original ibasso rom, but it just stood about 1 hour coz it have no bass at all, i think it suit the vocal / acoustics genre that don't need much bass bost, but i am a basshead audiophileI tried the fidelizer rom a couple of times (2 versions) as i use it on my laptop very successfully and each time i had an issue with installing it, it seemed to work in the end but i have not tried the newest version which is supposed to avoid these issues as i was to worried about bricking the unit, i have used the lurker roms with great success.
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i didn't try fidelizer lower version of rom.