Tried flashing with TWRP... On trying to reboot it says that no o/s is installed. Don't know what went wrong. But on restarting, got the stock recovery and boot logo. But phone is stuck on Lenovo boot screen.... Reflashed CM12 rom by @ED300
got this problem too , tried flashing S061 zip on my A6000 SE from RR 5.7.4 using TWRP but it failed with error message cant mount blablabla to /data and if I reboot it says I have no OS installed. Also I already tried to extract system.zip and ota.zip but it still fail with same error. Anyone can give a clear instruction to flash this ROM ?