if u want u can unpatch key5 and still got cfw.
downgrade with pandora - > isnatll custom ipl. then unpatch key5 with latest key cleaner by Chilly Willy if u unpatch before installation of custome ipl u'll brick. install 3.40OE then go to 3.52m33. If u install 3.52m33 directly from 1.50 by xkploit patch, key5 will be patched again by m33 way. if u want install custom ipl again. make nand backup.