QCN backup is not for restoring into another phone. It can only be restored in the same ESN phone. QCN is provided to compare each NV item, side by side, along with the QCN of the locked phone so the hidden RF item will be found. HTC M9/+ requires S-Off for any LTE band modifications. A custom international ROM may also be needed. carrierpolicy.xml in the EFS of M9 will have to be modified. All in all, never try to enable Band 40 on any USC, SPR or VZW phone or be prepared to lose it because the phone will not come in diag mode later.