N900T no signal problem

I have few N900T devices with no signal problem.
It was refurbished by some vendor, and it seems like they’ve done IMEI repair. When I check phone info with Octoplus, it shows different IMEI than the one that I check from phone setting.
This is first time I’ve seen that IMEI doesn’t match from Octoplus info and actual phone info.
Anyone has seen this problem? It gets blacklisted soon or later. I’m not sure if it’s because there’s two IMEI info.

Hope somebody knows the answer 🙂