Have been trying to sort this issue out for a while, finally found a solution! I'm sorry if some of this is a repeat but in case anyone else is having this issue, do the following:
1) If your display shows "(small 2) SAFE" - your radio is locked. To complete the waiting interval, you must turn off the ignition, but leave the radio on. I have found the wait period is ~1 hour.
2) When your radio is ready to be reactivated, it will have 2000 displayed on the screen. DO NOT PRESS PROG/PTY ANY FUNCTION KEYS. Doing so made mine go back into locked mode again.
3) Use the < > seek buttons to adjust the digits to your number, e.g., if you had code 1234, you'd hold down < until the value was 1234, and use > to adjust back up if you overshoot your target number.
4) Press PROG once. This should reactivate your radio. If not, perform the above steps again, double checking the number you have landed on.
For reference, no garage kit / computers can perform this unlock and my local SEAT main dealer was helpless to do anything about it. It took me a while to get this going as my radio
guide discussed using numbers 1-4 and pressing PROG, doing so will only get your radio locked again.
Hope this is of some
help.