[hellera]

I have had many phones that I managed to unlock bootloader, TWP flash, root, flash custom ROMs ... but this Cubot Note 20 Pro makes me feel frustrated ... I tried all the orders I knew plus others found on different profile sites. I tried all the commands I knew plus others found on different profile sites but I can't in any way unlock the bootloader. These are all commands given in adb, fastboot or bootloader:
fastboot oem unlock
fastboot oem unlock-go
fastboot flashing unlock
fastboot flashing unlock_critical
fastboot oem unlock_critical
I must mention that I am not a beginner, I have been working for many years with this kind of customization, Developer options, OEM-unlocking and USB-debugging checked, all MTK and ADB drivers installed. Nothing works, no command... it says "... command not supported in default implementation" or, in bootloader mode it says "waiting for device"... waiting forever. I need unlock the bootloader first of all for rooting my device and other reasons. More than that, I reinstalled stock ROM, unlocked FRP using SP-flash tool ... but I have the same errors.
I attached some screenshots with these errors... I'll be happy if anybody can help me with any suggestions. Thank you.

[X3non]

I have had many phones that I managed to unlock bootloader, TWP flash, root, flash custom ROMs ... but this Cubot Note 20 Pro makes me feel frustrated ... I tried all the orders I knew plus others found on different profile sites. I tried all the commands I knew plus others found on different profile sites but I can't in any way unlock the bootloader. These are all commands given in adb, fastboot or bootloader:
fastboot oem unlock
fastboot oem unlock-go
fastboot flashing unlock
fastboot flashing unlock_critical
fastboot oem unlock_critical
I must mention that I am not a beginner, I have been working for many years with this kind of customization, Developer options, OEM-unlocking and USB-debugging checked, all MTK and ADB drivers installed. Nothing works, no command... it says "... command not supported in default implementation" or, in bootloader mode it says "waiting for device"... waiting forever. I need unlock the bootloader first of all for rooting my device and other reasons. More than that, I reinstalled stock ROM, unlocked FRP using SP-flash tool ... but I have the same errors.
I attached some screenshots with these errors... I'll be happy if anybody can help me with any suggestions. Thank you.

are you using latest fastboot binaries? you can get these from google's platform tool @ https://forum.hovatek.com/thread-17104.html
running the command "fastboot --version" should output 31.0.1 i.e latest as of now

[hellera]

I have had many phones that I managed to unlock bootloader, TWP flash, root, flash custom ROMs ... but this Cubot Note 20 Pro makes me feel frustrated ... I tried all the orders I knew plus others found on different profile sites. I tried all the commands I knew plus others found on different profile sites but I can't in any way unlock the bootloader. These are all commands given in adb, fastboot or bootloader:
fastboot oem unlock
fastboot oem unlock-go
fastboot flashing unlock
fastboot flashing unlock_critical
fastboot oem unlock_critical
I must mention that I am not a beginner, I have been working for many years with this kind of customization, Developer options, OEM-unlocking and USB-debugging checked, all MTK and ADB drivers installed. Nothing works, no command... it says "... command not supported in default implementation" or, in bootloader mode it says "waiting for device"... waiting forever. I need unlock the bootloader first of all for rooting my device and other reasons. More than that, I reinstalled stock ROM, unlocked FRP using SP-flash tool ... but I have the same errors.
I attached some screenshots with these errors... I'll be happy if anybody can help me with any suggestions. Thank you.

are you using latest fastboot binaries? you can get these from google's platform tool @ https://forum.hovatek.com/thread-17104.html
running the command "fastboot --version" should output 31.0.1 i.e latest as of now

Yes @X3non, I'm using platform-tools_r31.0.1 on Windows 10 pro, and the latest ADB and fastboot v1.0.41 from here: https://forum.hovatek.com/thread-26886.html
I tried even flashed the previous version of stock firmware (CUBOT_NOTE 20 PRO_A013C_V07_20200928)... not working, I have the same errors. Again, I attached a screenshot with the errors... I found a method for unlock bootloader with a 16 digits code: fastboot oem unlock ****************" (replace * with 16 digit unlock code)... but where can I found this code?!? Anybody knows? Thank you.

[X3non]

Yes @X3non, I'm using platform-tools_r31.0.1 on Windows 10 pro, and the latest ADB and fastboot v1.0.41 from here: https://forum.hovatek.com/thread-26886.html
I tried even flashed the previous version of stock firmware (CUBOT_NOTE 20 PRO_A013C_V07_20200928)... not working, I have the same errors. Again, I attached a screenshot with the errors... I found a method for unlock bootloader with a 16 digits code: fastboot oem unlock ****************" (replace * with 16 digit unlock code)... but where can I found this code?!? Anybody knows? Thank you.

i doubt you'll need any extra bootloader codes, if the OP @ https://forum.hovatek.com/thread-38339-p...#pid210748 was able to replicate the same and even get root
confirm that you still have OEM unlock enabled in settings > developer options
also ensure that the phone is in bootloader i.e fastboot mode with fastboot clearly indicated on the screen

[hellera]

Yes @X3non, I'm using platform-tools_r31.0.1 on Windows 10 pro, and the latest ADB and fastboot v1.0.41 from here: https://forum.hovatek.com/thread-26886.html
I tried even flashed the previous version of stock firmware (CUBOT_NOTE 20 PRO_A013C_V07_20200928)... not working, I have the same errors. Again, I attached a screenshot with the errors... I found a method for unlock bootloader with a 16 digits code: fastboot oem unlock ****************" (replace * with 16 digit unlock code)... but where can I found this code?!? Anybody knows? Thank you.

i doubt you'll need any extra bootloader codes, if the OP @ https://forum.hovatek.com/thread-38339-p...#pid210748 was able to replicate the same and even get root
confirm that you still have OEM unlock enabled in settings > developer options
also ensure that the phone is in bootloader i.e fastboot mode with fastboot clearly indicated on the screen

I finally managed to unlock the bootloader! Every time I gave the command "adb reboot fastboot" an "fastbootd" appeared where I had all those errors. And when from off mode we press volume up and power we enter a fastboot where it was not recognized by the pc. The only mistake was that, from off mode, I had to press the power button first and then volume up! So, simple ... "fastboot flashing unlock"!
Of course, after this, I rooted my Cubot. Thank you for your help.