Dude, i faced the same issue! and let me guess, you used TWRP to flash the ROM, right?
Anyway, I was flashing CM11 as it was said that it was stable!(not true!) I used minimal adb and fastboot to boot it into recovery and when i tried it with TWRP it failed! (*Footer is wrong*) I rebooted and it was stuck in bootloop!
SOLUTION:
You'll need Minimal ADB and Fastboot drivers for this and the required flashable zip files for this
Recovery downloads:
CWM - "www15.zippyshare.com/v/j9lHGdJf/file.html"
TWRP - "www75.zippyshare.com/v/vHVH8ARI/file.html"
1. start it in it's bootloader (vol-down + power) (you'll see "long press power button can reboot the phone" at the bottom of the screen in tiny letters)
2. connect your device to your PC (it should be able to read your device and you'll see the lenovo a6000/plus in "my computer/this pc"). If the zip files are not in the sd-card then please do copy them there in the root folder (the main folder once you open the external memory/sd-card). (* IMPROVISE!! do this by using a card reader too, if needed*)
3. start the command prompt in the folder where the minimal adb and fastboot drivers were installed and type "adb devices". This will show your connected device.
NOTE: unzip and copy the REQUIRED "recovery.img" (either CWM or TWRP) into the folder where the minimal adb and fastboot drivers were installed so as to boot into the desired recovery mod and then proceed into the next step.
4. then type "fastboot boot recovery.img" (use only TWRP for flashing stock ROM and CWM for custom ROMs)
5. once in recovery select the necessary ".zip" file(s) and flash. (Download link for stock ROM is given at the end)
6. if the recovery says "done/success", reboot and ENJOY!!! (note: give it time for its "FIRST BOOT"

) if not try a different recovery and proceed from the 3rd step.
Hope this works! :fingers-crossed: Good luck! :good:
Stock ROM:
A6000 - "firmwarefile.com/lenovo-a6000"
A6000plus - "firmwarefile.com/lenovo-a6000-plus"
**Copy the links, paste them in your browser's navigation tab and hit "Enter" to go to the sites