[Honor 9 Lite  ROMs, Kernels, Recoveries, & Other D] EPT-3:
Following your precious instructions (Alf's guidance above) I did manage already some progress!

Actually I did get to a state for my device sooner than I wished for long...

But now I feel more confident to revitalise it from a soft-brick (I think it still is soft...)

I will try to explain for anyone else interested as well;

Alf's suggestions are especially welcomed!

I got the correct firmware (LLD-L21A 8.0.0.122(C636)) from the alternative link and successfully managed this time to follow Alf's dload process!

[ I did many mistakes in the past (I even copied the extracted dload folder with the .zip (!) files inside, instead of the correct .APP type...). As I should knew (...) the fastboot COMMANDS accept only .IMG types of files for flashing, the abd/Recovery COMMANDS accept .ZIP types of files for side-loading and flashing through the Recovery interface (e.g. TWRP) and the "dload" method (for Huawei devices particularly) accept .APP types of files. I hope I am correct by and large for these 3 commonly available emergency Android access methods... ]

So, I followed Alf's 2 crucial steps:

[ see also the attached images! ]

Firstly, I closely followed his suggestion to fastboot flash the Stock Recovery .IMG file (extracted form the above mentioned correct firwmare (LLD-L21A 8.0.0.122(C636))/Service ROM with the Huawei Extractor sub-tool, included in the Huawei Multi-Tool v8.0.8.9.exe/Application). I pressed the 2 buttons to enter the device in fastboot mode (vol- & power) and succeeded! Though, I have to mention here that the device did boot into fastboot BUT in a COLDBOOT 0 (or sometimes a COLDBOOT 16) state, for reasons I don't yet fully grasp, possibly because the lack of an appropriate Stock Firmware inside my soft-bricked device...

So a issued the needed command:

fastboot flash recovery_ramdisk RECOVERY_RAMDIS.img

And it succeeded!

Secondly, I extracted the 2 .APP type files from the firmware zip file and copied their structure in a fat32 SD-CARD.

I think, I renamed both .APP files to "UPDATE.APP" into the dload structure (especially the 2nd one, from "update_sd_LLD-L21A_hw_spcseas.app" to just "UPDATE.APP") and put the SD-CARD in the slot.

[ Possibly also, it did work when after trial & fail I just deleted the 2nd "UPDATE.APP" from the SD-CARD, because when later I detached the SD-CARD (see below) I found only one and only "UPDATE.APP" in the SD-CARD under the dload folder... ]

So , I then pressed all the 3 buttons of the Huawei H9L to get a software/update mode and it succeeded again!

The first positive sign I noticed, was the message "Your device is booting now..." without any 1, 2, 3 choices to press the power button etc. which -in my case- leaded to a fail...

Then, the 2 most wanted screens appeared in the device: First, the "installing update..." message (but stuck at 5%, as I expected...) and, secondly, when I pressed some button combinations (I think vol+ & vol- OR vol- & power, OR even all 3 buttons) I came up with the -most wanted- eRecovery Screen!!!

There, options 2 and 3 were grayed ("Emergency backup" & "Wipe data/factory reset) and I had only the other 3 options: "Download the latest version and recovery", "Reboot" and "Shutdown". I chose the 1st and (as I expected, I had no luck with WiFi due to my soft-bricked device/lack of any credible firmware/ROM inside...). I tried some more times without luck...

Then, I decided to try flashing a CUSTOM Recovery (instead of Stock, as Alf suggested) and when I flashed:

fastboot flash recovery_ramdisk TWRP.img

(actually, one by Alf again, in his post in "Recommended and tested TWRP Recovery" (https://xdaforums.com/t/recommended-and-tested-twrp-recovery.4199099/post-84056933) and I think the one described as "3.2.1-0 by pretoriano80 (with data decryption on Android 8 )")

...It succeeded!

Then, just by chance, I pressed all the 3 buttons of the device (vol+ & vol- & power) and -incredibly- I show for the first time a TWRP (see image below) on the screen of a Huawei device!!!

After that, I tried 2 steps:

First, I tried to do a "Wipe/factory reset" and second, to detach (with the TWRP up and running) the SD-CARD from device in order to paste inside SD-CARD the whole correct firmware/"Service ROM" that Alf suggested (LLD-L21A 8.0.0.122(C636)) as a single .ZIP file, flashable easily now by the newly installed TWRP!

However, I experienced:

1. A not fully seccessful "Wipe/factory reset" with TWRP (it didn't recognised the PRODUCT partition...)

2. When I (mistakenly) proceeded to the second step (TWRP flash Service ROM .ZIP file) I had a bad experience with my device in a Black Screen now... Possibly reasonable though, because with my mistake of not-succeeded/ partial "Wipe/factory reset" I have now deleted even the "splash" partition (?) so in my device there is nothing to display on the screen and, inside it only ROM "residuals"... I will upload also the recovery.log I got!

In conclusion, this is my current state for now...

However, even Black, my device CAN be in a fastboot state through the USB/PC connect, so I would guess that with a little help I can repeat (successfully now...) the process...

The first thing I guessed is that I can fastboot-flash again some needed partitions (?) to get in a previous "softer-bricked" state...

I hope my experience so far may help other users too.

I would like here to thank AGAIN senior user Alf for its "confidence-blowing" intervention...!

I would wait for his better-than-mine, deep-knowledge suggestions!!!

Thanks!!!