[Huawei P Smart+ 2019 Questions & Answers] digaly:
So my mom and I have the same phone, a Huawei P Smart 2019 pot-lx1.

The problem

The phone started doing a boot loop anytime you try to turn it on.

It vibrates and shows the Huawei logo like normal, but after the logo the screen turns dark (not off, just dark, the backlight seems to still be on).

Sometimes after this black screen, a 'recharging' icon is visible in red for a brief moment. It's a red circle with a red lightning symbol in the middle.

It does this regardless of whether it's plugged in or not.

I have no idea what this means because as far as I'm aware, the device can function fine without power (see further down below).

After this black screen or flashing the red recharging icon, it just reboots and does the same.

What I tried

The phone refuses to open Erecovery mode (hold volume up and plug in the device). I have confirmed that this method -should- work since I tried it on my own phone of the same model. In the case of my mom's phone it just shows a black screen like normal.

I can get the phone into fastboot, which is great. It tells you to open HiSuite on your computer, which I do, only for HiSuite to tell me "Your device is not supported for system recovery". Furthermore, any commands that could help me return 'Command not allowed', this is returned from the bootloader of the phone and is NOT an OS permissions issue. I've tried stuff like booting into TWRP or wiping userdata this way but it's simply not allowed.

Regarding the battery, I've tried unplugging the phone while it's in fastboot mode. It just stays on like expected and doesn't turn off, so I don't think the battery has no charge.

From what I gather online, the phone has an FRP lock which prevents you from doing anything that could result in the phone getting a reset. FRP can supposedly be disabled, I've tried dc-unlocker but it simply didn't work, presumably the phone is 'too new' because it wasn't in the model list. (I used detection & then the blue nuke option that said Temp FRP unlock or something like that). There are sites that offer FRP unlock passwords which can be used with 'fastboot oem frp-unlock XXX' but I REALLY don't trust these sites and the prices are expensive.

USB debugging is not enabled and I cannot possibly enable it because the phone will never boot, hence I cannot hop into adb and disable FRP that way or do anything else that adb could. I'm essentially stuck.

I also tried some random things like holding volume up + volume down + power during boot. I have also tried countless times to get into erecovery but it simply will never get to that point.

I also tried downloading the phone's firmware and putting all the files where the UPDATE.app is also located in the 'dload' folder on an SD. I also tried putting an 'update.zip' in the root, but this didn't do anything and I think it's pointless unless you can boot into erecovery.

My mom and dad suspect they damaged something related to charging the phone, either the pins or something inside the device by inserting the charger agressively, is that possible at all? It could explain the red charging icon regardless of battery status, but I'm really not sure.