[help] error Attention! Please update system again

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Senior Member
Feb 13, 2010
Xiaomi Redmi 5A
It's not my phone but of a friend. Huawei P8 lite 2015. She is not technical, so she doesn't have any idea what could have happened. She just normally uses the phone and now it is doing this
Func no 10 (boot image)
Error no 1 (security verify failed!)


She said she was getting a similar error (with a green android) already before but she always managed to get over it by holding some button and then tapping on that link and the phone then booted. (yes I told her WTH didn't she care back then about the error) Now with this one she can't do anything.

How could this have happened and is there a fix which doesn't mean erasing everything?
If I get into a Fastboot mode, connect this to a PC, can I then access the data and photos in it at least via HiSuite for example?