Here are the steps for the ps3 on 3.55. 1. Download the 3.55 remarry files from ps3devwiki. Extract them to the root of a USB. 2. Download ofw 3.30 as an init pup from ps3devwiki. Put it on the Root of the USB with the other files. 3. Put the ps3 in fsm with a fsm dongle or compatible device in the furthest right USB port. The ps3 will turn off automatically. 4. Take the fsm dongle out and put the USB with the remarry and 3.30ofw file on it in the right USB port. Turn ps3 on. It will start process. After it is done, it may shut itself off. If it does, don't panic. Turn the ps3 back on. It should boot up and still be in fsm. Now you must play a blue ray movie. It HAS to be a blue ray movie or you won't restore the keys for blueray playback. Once you play a blue ray movie for a few minutes, then you can turn the ps3 off. Put the lvl2diag fsm exit file on a USB and turn the ps3 back on. Should exit fsm. Success!
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Follow the same steps for the other console that is on 3.42 except before doing the steps, download 3.55noBDnoBT pup from ps3devwiki and install it. Afterwards you will be on that 3.55 firmware and you can do the same steps as above.