Root finally achieved on CAT B15Q.
I tried all the simple methods, none worked.
I used PDAnet USB drivers.
To achieve root, I made a recovery using the CWM method with SP Flash Tool V5.1408.00 following this guide
chinaphonearena.com/forum/Thread-Tutorial-Ultimate-no-root-backup-CWM-MT6582-MT6592-MT6589-MT6589T-MT6577-MT6595
Recovery was patched using MTK Droid tools. However, SP Flash Tool V5 would not flash the phone with the patched Recovery and Boot files, so for that I used SP Flash Tool V3.1332.0sn187. Then root using MTK Droid tools - Superuser (SuperSU failed). Also useful was this guide
chinaphonearena.com/forum/Thread-Tutorial-How-to-build-CWM-and-root-Bedove-X21-MTK6577-and-other-MTK-phones
Note: When plugging phone in for flashing (this is done with the phone OFF), put battery in, plug cable into phone, hold volume down button when you plug the USB cable into the computer.
Checking with a root checker, it told me I did not have full root access, even though Superuser appeared to be working, I only had temporary root.
I then used Root Genius, which finally achieved full root.
A bit of messing around, but worth it.
I tried all the simple methods, none worked.
I used PDAnet USB drivers.
To achieve root, I made a recovery using the CWM method with SP Flash Tool V5.1408.00 following this guide
chinaphonearena.com/forum/Thread-Tutorial-Ultimate-no-root-backup-CWM-MT6582-MT6592-MT6589-MT6589T-MT6577-MT6595
Recovery was patched using MTK Droid tools. However, SP Flash Tool V5 would not flash the phone with the patched Recovery and Boot files, so for that I used SP Flash Tool V3.1332.0sn187. Then root using MTK Droid tools - Superuser (SuperSU failed). Also useful was this guide
chinaphonearena.com/forum/Thread-Tutorial-How-to-build-CWM-and-root-Bedove-X21-MTK6577-and-other-MTK-phones
Note: When plugging phone in for flashing (this is done with the phone OFF), put battery in, plug cable into phone, hold volume down button when you plug the USB cable into the computer.
Checking with a root checker, it told me I did not have full root access, even though Superuser appeared to be working, I only had temporary root.
I then used Root Genius, which finally achieved full root.
A bit of messing around, but worth it.
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