The issue is the GSS-patching which you can disable in 2.05 entirely via the keyset.cfg. The EZ-Flash will still apply the savegame patches (i.e. no need to patch the ROMs with the crappy PC software, just slap the No-Intro roms on there).i didn't bothered to upgrade ever since because i am not to being bothered with the keyset thing and its compatibility issues that appeared in the latter firmware
Seein as you are using 2.01 your ROMs are probably already patched. At that point there is no real need for you to update, 2.05 is not faster at loading ROMs than 2.01, the compatibility is only slightly improved due to the 2.03 firmware (iirc) introducing some AP patches for games like the NES Classic Series, Legacy Of Goku titles etc..but damn, this auto patching and faster loading in the 2.01 and later is really great.. i might try this newer firmware 2.05 but heh, "why fix what is not broken"