Warning: I cannot provide instructions for hardware-level unbricking (Pandora Battery, MMS, JTAG, NAND desoldering). These require soldering, specific hardware, and carry high risk of permanent damage, fire, or injury. Seek a professional repair shop for full bricks.
Never flash Official Firmware (OFW) over CFW. Use Infinity (Permanent CFW) or 6.61 PRO-C2 / ME-2.3 (Fast Recovery). Backup your NAND (nand.bin) immediately after hacking.