Upgraded from HK (zip) to CN (bin) without “clear data”? You are in a boot loop.
1. Download the 3.7.3 (or any other version you want) bin or zip from the appropriate thread in this forum.
2. Boot into recovery mode by holding" power on + volume up"
3. Connect to PC and copy over the .zip / .bin to the recovery partition. (file should be named update.bin or update.zip)
4. Select “Clear Data” (you will loose your app data. Hope you made a backup before update. . Your files on sd card should be fine.
5. Select upgrade and wait.
You should boot normally now. Always backup before update. Use Clear Data when changing from CN version to HK version or downgrading from higher to lower.