ok guys, SEUS is up and running again, i just flashed my p1i after change my cda using xs++. Confirmed.

During update, before it gets to downloading firmware page, SEUS will detect your phone and its region, if the server is running fine, it will show your phone type actual picture e.g P1i. If the picture shown were wrong (general SE phone instead of your phone), then you'll know that SEUS has problem.

U can find that on the SEUS website, it's recommended that battery level should at least 50%, i think that to play safe, let it charge yours for at least 60% ++ before proceed updating. It's your call, good luck.