Not sure. it's possible for it to auto resume. Worst case, you will brick your phone.
Either way, you should have made a backup manually (and, i think the DM makes one, too)
This is why i tell people to do the upgrade manually; Assuming nothing goes wrong, it takes about 30 min on an 8900.
OTA/automatically via DM is prone to all sorts of things going wrong.
The more you can control about the process, the fewer shots you have for something to go wrong.
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