Hi
axisrmThank you for your asking. Please refer to the link below
ZenFone4 Max (ZC554KL) - SupportPlease note that Version WW-15.2016.1907.519 is the last firmware version of ZC554KL.
For Driver& Tool of ZC554KL, please check the link below
ZenFone4 Max (ZC554KL) - Support Besides, for your SD card question, kindly provide the information below so that we can better assist you.
1. Does the issue happen before? Does the issue appear right after any system/apps' download or update?
2. Does the issue happen in other SD card?
3. Does the issue remains the same after performing "Factory Reset"?
Settings>System>Reset options>Erase all data(factory reset)
**Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.
https://www.asus.com/support/FAQ/1036182/