too bad you didn't back-up your GDFS, cuz you don't have one now, you wrote a patch on your GDFS when you clicked write GDFS, GDFS can be repaired but I'm not sure how, until then your phone is good as a brick. maybe there is someone on this forum that knows how to repair a GDFS, the problem is that GDFS is unique to each phone by IMEI and you can't load a GDFS from another W810i, I'll try to ask someone how can you repair your GDFS and If I have something I'll get back to you, anyway you can't do nothing now, try to read and search more on how to repair GDFS. Repairing your GDFS is the first thing to do!