To recover from a possible brick in the future it is recommended to create a NAND or NOR flash backup while everything is still operational.
To do that, first plug a thumb drive to your PS3. Now open multiMAN, go to mmOS, open File manager and select any file. Press O on the gamepad and select Open in HEX editor from the menu. Now press Select on the gamepad, then Start. Answer No to the first question, No to the second one and Yes to the third one. Copy process will start. You have to confirm the successful damp and then the questions will appear again. This time answer no to all of them. Remove the thumb drive and plug it to you computer. Here’s you NAND NOR backup! Make several copies to different storage devices, just to be sure.