Reason for it i think is the file..
Happened to me 3 times trying to update to 5.50 GEN-A from 5.00 M33-6.. All 3 times i bricked, i get stuck at 99% updating.. Those 3 updaters are from 3 different sources as well..
You just have to find the one that'll work for your PSP... I found one that works on mine.. Let me know if you wanna try that.
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