lets not forget the 1.00 original (yes wee can't have it via eboot but there is a 1.00 installer out there)
as mentioned 1.51 and 1.52 are missing but there were also regional updates initially up untill i think about 2.01 as well, however this is still the most complete list available yet.

i think there was a downgrader from 1.50 to 1.00 somewhere but only the original 1.00 psps could use 1.00 i think

u_c_taker Wrote:i think there was a downgrader from 1.50 to 1.00 somewhere but only the original 1.00 psps could use 1.00 i think

Nope, any 1st gen (TA-079) PSP can be DG'ed to 1.00. Also There is a Bogus 1.00 EBOOT downgrader, but not for the public :\

Your thinking of 0okm's method from way back, I think. (That thing was so... damn slow. It took 20+ minutes to backup 1.00)

My PSP with a UP runs 1.00 and 3.71 M33.

(This post was last modified: 08/02/2008 12:11 PM by xero1.)

what do u use the 1.00 for?

1.00 loads homebrew very fast, I'm talking IRShell speed. It's a nice FW for testing and modifying.

If one was to flash a 1.00 NAND image without the IDS it will run and install 1.50 that has some bad key, more keys than key cleaner can fix. Its just a quick and lazy way of De-bricking older PSP's.

it was a curiosity more than anything else - it was good to get my psp back to its original 1.00 if only briefly, and yes i do think it was ookms.