enfone 4 selfie Stock recovery problem

I was trying to install the android 9 update on my asus zenfone 4 selfie but when i click "install an update from sdcard" it says "unable to mount /sdcard", how do i fix it?
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Hi itzmarioplayz123
Thank you for your asking. Kindly provide the information below so that we can better assist you.
1. You may try to change another SDcard.
2. Besides, what is your current firmware version and which version would you like to update?
#Settings>System>About Phone>Software information
3. For ZD553KL, only firmware downgrade requires SDcard for manual upgrade/downgrade.
For manual update, please try to download the file into the root directory, aka the outermost place, of the internal storage>Reboot>Tap "the system update" notification.
https://www.asus.com/mobile/phones/all-series/ZenFone-4-Selfie-ZD553KL/HelpDesk_BIOS/
I was trying to install this aosp update
So, have you installed the firmware successfully?
If you still could not install the firmware, as I mentioned above, please provide me
1. Your current firmware version
2. Please make sure that your firmware is WW-15.0400.1907.513 or WW-15.0400.1910.518, then try the manual update with internal storage
For manual update, please try to download the file into the root directory, aka the outermost place, of the internal storage>Reboot>Tap "the system update" notification.
https://www.asus.com/mobile/phones/all-series/ZenFone-4-Selfie-ZD553KL/HelpDesk_BIOS/
I installed it successfully
and i got some reviews from this firmware.
First the dark mode: dark mode doesnt work.
second the microphone: the microphone in this firmware is buggy, you need to connect a bluetooth earphone first so you can use the mic. Can you fix it?
Hi itzmarioplayz123
Thank you for your asking. WW-AOSP-16.0200.1907.19 is Android 9 beta version. If there is any function do not meet your preference, please try the Factory Reset first. If the issue remains the same and you prefer Android 8, please perform the downgrade file Version Version ZD553KL_P_downgrade_to_O with SDcard. Sorry for any inconvenience it may be caused.
https://www.asus.com/mobile/phones/all-series/ZenFone-4-Selfie-ZD553KL/HelpDesk_BIOS/
#Android P to Android O Guide
https://www.asus.com/support/FAQ/1039929
I will use this firmware and I'll wait for the stable version of this firmware
For ZD553KL, ASUS had continuously supported for more than 27 months and there will no longer be any system updates and maintenance.
Sorry for any inconvenience it may cause. Thank you for your understanding and support.
So the firmware update will be stuck on beta?
Also is there a bootloader unlocker for asus zenfone selfie 4
Yes. That is what the mod said
Can you send the link because i cant find it
Link of bootloader unlocker
Hi itzmarioplayz123
Thank you for your asking. Officially, ZD553KL does not provide the unlock tool. Sorry for any inconvenience it may be caused.
Okay thank you for the information