I had this issue just yesterday, for the first time, on illusion 4.2. Status bar clock froze, while the regular clock worked. Systemui restart updated status bar clock to correct value, but it was still frozen.
As for RIL, i had tons of bugs with it, but one single cause - imei was read as unknown on boot. After every restart I'd check if imei was read properly and if it was not, I'd restart the device till it was.
To install custom roms on O4x:
1. upgrade to jb
3. unlock bootloader
4. flash custom recovery (cwm)
5. flash roms
6. if you encounter any issues, search, they've been answered already.