Infinity firmware, its not FULLY A cfw, but more like an hybrid firmware.
It takes 6.31 and 6.61 and creates an hybrid firmware, it uses a vulnerability found on 6.31 in order to execute homebrew code during the boot process.
it uses 3 applications:
The Builder: its the builder to create the hybrid firmware using both OFW.
The Flasher: installs the hybrid firmware.
And the Infinity boot-loader configuration: this selects the custom firmware that this going to be launched each time the psp turns on.
as i stated before, infinity its a semi permanent patcher for "forbbiden boards" on the psp.
The forbidden mobo started with the ta-085v2, and it cant create a Pandora battery, kinda useless now days afaik. the only PSP you really should avoid, its the PSP E1000, aka PSP Street.
as i also mentioned above, your best pick would be the Psp Go! also, hacing a permanent patch on a psp its not a big deal, at least not for me, turning a CFW ON with just launching an app, its not that tiring.
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O yeah, btw, you dont need to make it permanent, you can also use the CFW-PRO, that's the one i always used.