Start reading thoroughly THIS FORUM.
It has everything you need. From here I downloaded everything. Plus I used Chrome to read the Chinese forum on Sosaw. Chrome has relatively good auto-translation.
Initially, I tried 2.14 on JB 4.1.2 but did not work.
Then, I downgraded to 4.1.1, Omega V6.1 - ZSALJA with integrated kernel.
It still features minor glitches like battery icon showing a discharged battery but works like a charm. Please read carefully the forum, especially the first posts, where everything is. Then get the libgarminos.os for 1280x720. For me it worked from the first try. Both internal GPS and external bluetooth gps work (external is more precise, using bluetoothgps.apk).
If moderator allows and you will not be able to choose the appropriate files to make them work, I could upload the whole package somewhere. Cheers.