[Huawei P9 Guides, News, & Discussion] zgfg:
To recapitulate, your phone:

- is bricked (you cannot boot to System=Android)

- FRP=OEM is locked (seen from your photo of the Fastboot screen)

- Bootloader is locked (seen both from Fastboot photo [it says Phone locked] and from Fastboot commands query)

Also, per your Fastboot query commands, your phone is currently on cust c900 (because you attempted to flash c900b136)

Cust c900 is some 'cross' cust, used only for rollbacks to EMUI 4.1 / Android 6 (Marshmallow), and there are no updates to EMUI 5 / Android 7 for cust c900

Therefore, you must do things in the following order:

i) Unbrick the phone = get it anyhow to boot to System (your current cust c900 with EMUI 4.1 / Android 6 (Marshmallow).

To be able to enable Developers menu and from there to unlock OEM.

There is no other way to unlock OEM=FRP (except for paying to DC Phoenix)

ii) Only when FRP will be unlocked, you will bevable to unlock Bootloader (of course, you will also need Bootloader code - but Bootloader code is not enough, you need both the code and FRP to be unlocked)

iii) Only when Bootloader will be unlocked, you will be able to install TWRP, to flash OEMInfo for c432 and to rebrand to c432 (or any other cust different from your current c900)

iv) Only when you rebrand from c900 (to eg European c432), you will start receiving OTA that will update you to EMUU 5 /Android 7 (Nougat).

There is no other way because (i) is needed for (ii), (ii) for (iii), (iii) for (iv)

Even if you agree to stay on EMUI 4.1 / Marshmallow (MM), you must unbrick your current c900 with b136 or higher.

Also, it must be FullOTA (if not from the name, FullOTAs can be recognized by size, they must be over 2 GB)

Don't attempt to flash any firmware with the cust different from c900 - you can only make things worse

This is why your last link is of not much use - they list firmwares but on the front page they only say like:

EVA-L08 b387

EVA-L09 b361

etc

When you click on EVA-L09 to open a download page for the particular FW, only there it says for which cXXX cust it is.

I browsed through several of them but I didn't find any to be:

- cust c900

- build b136 or higher

- FullOTA (2 GB or higher)

Even on the download page, for some it is not declared for which cust it is, only that it is from Australia or so (pretty unprofessional and risky, if somebody who is on eg c636 flashes their FW for c432, without having Bootloader opened, without TWRP and without OEMInfo for that new cust c432, he will brick his phone)

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To summarize, you have no other way but (first) to make your phone boot to c900

Hence you must flash (again) FullOTA package for c900, b136 (or higher)

From the GDrive link you listed, I cannot see from the name

B136_full_update.zip, is it rall6y for c900 cust or else

It seems it is over 2 GB (like FullOTA) - you have downloaded, can you unzip and provide screenshots from the PC to see the structure (folders, files, names, sizes)

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From another link you listed, it goes to

https://xdaforums.com/p9/help/problem-flashing-stock-rom-eva-l09-t3721306/post74887739

There, you have another download from Mega for dload-huawei-p9-eval09-eva-b136.zip, it's over 2 GB as FullOTA, but again name does not clarify is it really for the cust c900

In the post they say it should be for c900

But, in the post they describe how it must be flashed, in two DLOAD steps - did you flash it that way, in two steps?