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I am using Ubuntu and while attempting to root my Cubot R11 phone using fastboot, I ended up on a boot-loop cycle. Also, power+volume-up to enter recovery mode isn't working.

Cubot orange state screen

Orange State

Your device has been unlocked and can't be trusted
Your device will boot in 5 seconds

How can I fix this issue (Linux tools preferred)?

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You can use SP Flash Tool. You need MediaTek MT65xx USB VCOM Preloader USB Drivers for it. If you care about data, you should make a full rom dump (or at least nvdata metadata oemkeystore and userdata partition). You need a scatter file for this. A scatter file you can create with WwR MTK v2.30.

If fastboot is working, you can try "fastboot format:ext4 cache" to fix bootloop. You can try to port a TWRP and "fastboot boot recovery.img" then you get full access via adb in recovery (and if metadata is still intact it will hopefully decrypt userdata).

If the bootloop is caused by flashing TWRP, install Universal Disable_Dm-Verity_ForceEncrypt.zip to disable the dm-verity boot chain validation.

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