The text you provided ("mtksu failed critical init step 3 hot") is a specific kernel log error typically found on Android devices using MediaTek (MTK) processors. It relates to the device's thermal protection or "hot-plug" CPU management system.
Use the mtk tool from mtkclient (open source) to check:
Execution Environment: The exploit often fails if it isn't run from a specific directory like /data/local/tmp. Some users have reported success by simply re-running the command or re-issuing the chmod command multiple times if the first attempt fails . Recommended Troubleshooting Steps
Given the specificity and the somewhat unclear nature of the term, I'll guide you on how to approach finding information or a paper on this topic:
Step 7: Contact Support or Device Manufacturer