That is good to hear

Sometimes it does not seem to 'take' the first time even if you do it by the book.
At the moment i dont know about the TA91 MoBo but the TA88v3 and the slim&brite (3000) PSP's cant take Custom firmware
(
I just read that you can run it DevHook style on TA88v3)
Still you can use ChickHEN 1.20 on PSP-3000 with firmware 5.03 as long as you stay away from flash modification.