Never done it, but, I would think you would use the "UpdateEleaf.exe" and place the "Pico_Squeeze2_V1.00.bin" firmware file back on. Let us know if/how you get it done. Edit: I saw you stated Pico Squeeze...I would think process is the same just with a different firmware file. I just have the Squeeze2's
I did it on one of my squeeze2's, but don't remember the exact sequence. I think I got the firmware from the eleaf site and downloaded it then loaded it via the arctic fox tool. I liked having the bypass option which was not on AF
All you have to do is download the eleaf firmware and flash that onto your mod as usual. Since you're flashing the chip, you're getting rid of whatever's on it and replacing it whatever you're flashing at the moment. Done it a few times on other eleaf Pico models just for something to do.