Unbrick ZTE Blade L110 - 'fastboot devices' not working in 'Volume Up + Power' menu

I would like to ask for assistance:
- How to unbrick ZTE Blade L110 phone ?
- 'fastboot devices' is not working with the "Volume Up + Power" menu;
- How then to flash TWRP or similar Recovery ROM on bricked device ?

I have three such phones. Phone #1 is bricked (bootloop), Phone #2 is bricked (stuck with logo), Phone #3 is working (for now).

With Phone #3 (not bricked) (with Developer Options and USB Debugging activated), the 'adb devices' command reports the device and I can run 'adb reboot bootloader'. The phone restarts, displays the logo and the text 'Fastboot mode'. The 'fastboot devices' command lists the device.

(I think I can then proceed to 'fastboot flash recovery ...' in order to install TWRP or an alternative recovery ROM, in order to backup the working stock ROM and use it on the bricked phones. I have not yet tried because of problems with bricked devices, described below. And for fear of bricking this one too.)

With Phone #3 (not bricked) again: If I power off the phone and then I power it on with the "Volume Up" button pressed, a menu appears. It is in Chinese (I think). Some menu items perform hardware tests. The one-before-last menu item restarts the phone. The last menu item performs a hard reset.

But when this menu, obtained with "Volume Up + Power", the 'fastboot devices' command does not list the device ! (I have tried both the Windows and the Linux fastboot utilities.)

That is fine for Phone #1 -- I can use 'adb reboot bootloader' to enter the "Fastboot mode" supporting 'fastboot devices', as described above.

But how could I enter a mode which supports 'fastboot devices' on the bricked devices ?

Phone #2 and Phone #3 are unable to boot into Android. They too can enter the Chinese menu by pressing "Volume Up" when powering on. But they too are not listed with 'fastboot devices' at this point.

Would it be possible to correct me if I am doing something wrong or mis-understanding ?

If there is time, any help or idea is warmly welcome and appreciated !

Thank you respectfully for your time !

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