Only Bootloader working

So unfortunately it is getting very silent in this forum for this device... I hope someone has an idea. - much appreciated!

Today my HTC was very slow and I needed to restart it but unfortunately I only have access to the bootloader by now.

Whatever I choose in the bootloader menu, I came back to the bootloader. I have an unlocked HTC ONE Mini S-ON, HBoot 2.22, OS 4.14.401.1.
Tried last year CyanogenMod but switched back to an original ROM. I have TWRP installed but cant access it. All important functions I choose will bring me back to bootloader menu.

ADB doesnt recognize the phone, but fastboot does. Here are also my getvar infos:

F:\Temp>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 2.22.0000
(bootloader) version-baseband: N/A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.14.401.1
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid:
(bootloader) product: m4_ul
(bootloader) platform: HBOOT-8930
(bootloader) modelid: PO5820000
(bootloader) cidnum: HTC__102
(bootloader) battery-status: good
(bootloader) battery-voltage: 4310mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-0e1af350
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.103s

fastboot commands dont bring any success. E. g. erase cache fails or trying to update things fails, too.
My Win10 PC recognizes the device as "My HTC" when in fastboot USB.

I mean, it was just a restart?! Can someone give me a hint what else I can do?

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