before I go any further: I have a locked bootloader and I'd prefer to keep it that way (company policy).
What I have: A C5503 phone with 310-GLOBAL-LTE firmware, XZDualRecovery 2.7.85-BETA.
What I do: Flash 310 FTF with FlashTool, then run install.sh in XZD asking it to root the phone for me. After reboot I get the CWM PhilZ recovery screen and after yet another reboot the system starts normally having the NDR app installed - it crashes sometimes though, so far unreproducibly.
Next steps were tried using all recovery options (CWM, TWRP, PhilZ) with full pre- and post- wipes, zips on internal storage.
When installing CM10.2.1 (latest stable) I get no errors but the phone won't even start normally (i.e. not even the SONY logo, just a short vibe, black screen). Fastboot and Flashmode both work, recovery does not.
When installing CM11 (140210) I get an installation error saying (roughly) "some error occured". It doesn't fit on the display but there is no useful information in it anyway. I'll copy it here if needed. After this I get the SONY logo bootloop with only fastboot and flashmode available, recoveries lost as well.
Q1: Is it even possible to install CMx with locked bootloader? I can't see why not as long as I keep the stock kernel..
Q2: Is it me or are there bugs in CM builds? How can I debug better?