~
you should click preview before setting fee to lower than 1 s/b. here are the steps:
3374120 = 0x287c330000000000
3375000 = 0x987f330000000000
45505446ff0002000000000101f986276600cd73853eb4bb0f19cf268c1f76a5c4c08d17bac0351
ff3c
647b9882a00000000fdffffff01
287c330000000000160014f913638202550e3dc872f3b22443a5027c
d7ed99feffffffff987f33000000000000000201ff53ff04b2474601eaf2ae8580000000cf38e49
fe705077
6ee853c96ba4586eef5174e5af04f5875bfeaca63a518c11003e0b4cdc469de81434fed3e70fbee
77b3
48322a33fcb1c4e3cc638bd07680a00a0000000095ce0800
change to:
45505446ff0002000000000101f986276600cd73853eb4bb0f19cf268c1f76a5c4c08d17bac0351
ff3c
647b9882a00000000fdffffff01
987f330000000000160014f913638202550e3dc872f3b22443a5027c
d7ed99feffffffff987f33000000000000000201ff53ff04b2474601eaf2ae8580000000cf38e49
fe705077
6ee853c96ba4586eef5174e5af04f5875bfeaca63a518c11003e0b4cdc469de81434fed3e70fbee
77b3
48322a33fcb1c4e3cc638bd07680a00a0000000095ce0800
it can successfully sign the transaction with no problems. then you will have to find a way to broadcast this which is the problematic part.