Originally posted by another user
version 4.50 a slim
is that 4.50 OFW?
If so, u will need a lot more than you originally thought. You will require a flasher (e.g. E3 Flasher)
Which will downgrade your ps3 to a lower firmware.
If you wish to continue with this im happy to help. But if your not wanting to bother with the effort then sal good

long story short. Cant JB to CFW if on 3.55+ OFW without Flasher. Cant convert from CEX to DEX unless on CFW.