Boot back into TWRP, go to Wipe > Format Data, type yes , and reboot. This usually fixes encryption conflicts.

Do you know the of your Galaxy A20 (e.g., SM-A205F, SM-A205G, SM-A202F)? Samsung Galaxy A20 ROMs, Kernels, Recoveries, & Ot

Ensure you disable the "Auto-Reboot" option in Odin if you are installing TWRP for the first time, otherwise, Samsung's stock system will overwrite it on boot. Conclusion

For the uninitiated, installing a custom ROM on an A20 is a sacred, perilous ritual. It begins with unlocking the bootloader—a digital seal that Samsung warns will void warranties and disable Knox security features. This act is the first "jailbreak," the moment the user asserts control over the hardware they own.