Have you Qa flag your ps3?
Have you verified that QA flag is enabled by going to network settings and pressing the same time:L1 + L2 + L3 (press left stick) + R1 + R2 + dpad_down??
Be sure to enable in Debug settings>System Update Debug> switch to on.
Afterwards, turn off ps3 get into safe/recovery mode install Rogero 3.55 CFW v3.7
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Afterwards, install any cfw that your heart desires.