Unroot phone, lock bootloader and uninstall TWRP

Hey guys,

i bought my kenzo with a vendor software without LTE support.
I would like to solve the issue with the non working LTE on SIM 1 with this tutorial http://ift.tt/2c3UgCv.
Since I am not really happy about routing a new phone (just want to go stock as long as possible) I would like to know if i can lock the bootloader and especially remove TWRP after this procedure?

Can I just flash the global stable again or is there another process necessary?

Best regards,
stinkelefant

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