Have you been able to install the 538 with the HiSuite Proxy? It was canceled for me, but probably because it had a higher version on it
I haven't. I tried it soooo many times in different modes/settings, from different roms.
It requires you to use version 550 of Hisuite. Then you use HP (hisuite proxy) to patch Hisuite. Then you need to set it to V1 firmwares and tick "Old firmware". Then Hisuite shows proper B538 information when upgrading/downgrading.
THEN you need to remove your microSD card, or the update won't start. It says "Update not found" after going into recovery to flash.
But, after doing everything. I can get it to start updating, but it fails after verify, and just when it's about to start to install at 6%. It just says failed.
I check the log in HP and the last file that gets downloaded is actually from Huawei (hicloud.com) and it's some sort of "permission" file. Like recovery needs some sort of permission to install the update. If huawei says this version is Not Supported anymore, maybe that's why it fails. HP seems can't change that.
Here's the thing. In the three ZIP files we have all the B538 images in UPDATE.APP. Those can be extracted. I wonder if we can flash them some other way?