For those experiencing the 412 error.

Make sure you use only the OP config address when syncing. (I've deleted the rest leaving only one of them).
Sync speed is approximately 1000 blocks per minute.
After it syncs as a precautionary measure , make a backup copy of blk0001.dat + blkindex.dat.
u have update de blockchain for download whit the last block? The original is not good