We were wrong.
Newer hboots (like the one in stock, hboot version 1.04.0000) flash/check images in an way that prevents the phone from encountering a SECURITY WARNING mid flash. This is good, prevents us from bricking.
Older hboots, like the one in 1.03.605.10 (hboot version 0.95.0000) on the otherhand do not, and flashing over custom firmware with them can lead to the dreaded SECURITY WARNING. This firmware is from January 3rd, is buggy and well should not be used for any reason outside of initail root. Avoid it.
A tester helping develop a one click root encountered this today, he tried to downgrade from custom firmware.
So, do not downgrade below 1.12.605.6 without a reason, if you do understand how to recover. You most likely have no reason to be on old firmware at this point, outside of initial root.
If you have a SECURITY WARNING, don't freak.
Recovering from this error:
Until we have newer RUUs, you only have one maybe two chances to do this. Since you obviously know how to flash an RUU, I am not going to go through the
Flashing this firmware the stock (1.12.605.6) firmware will fix this error.
However if you get a MAIN VERSION HIGHER error while flashing, you only have one choice to recover, by flashing the newer than stock (1.12.605.9) firmware.
If you are having issues, or are freaked out come find me in the chat (check my signature for a link). If I help you, I expect a donation to the Boys and Girls Club in the name of REWT.