No success to slots - no boot of twrp or other images possible

Hey everyone,

is it necessary to get slot-success for booting twrp or a system image?
Why I get no active slot when I ask the current slot?

By booting in slot b, I get the error message, my phone is corrupt. By booting in slot a, the phone shows short bootsplash and shutdown.Then restart is possible only via power button+volume down. I flashed both slots with A 105 (https://androidfilehost.com/?fid=4349826312261719146) to find in Fairphone 3 unbricking
OEM and is unlocked, secure boot disabled. Showd Bootloader Version: 8901.2.A.0105.20191217
The LED does not light when I plug charger.

Output from getvar all:
(bootloader) version:0.5
(bootloader) hw-chip:SDM632
(bootloader) battery-soc-ok:yes
(bootloader) battery-voltage:3867047
(bootloader) variant:MTP eMMC
(bootloader) unlocked:yes
(bootloader) secure:no
(bootloader) version-baseband:
(bootloader) version-bootloader:
(bootloader) logical-block-size:0x200
(bootloader) erase-block-size:0x200
(bootloader) display-panel:
(bootloader) off-mode-charge:1
(bootloader) adb-enabled:0
(bootloader) charger-screen-enabled:1
(bootloader) max-download-size: 0x1fe00000
(bootloader) slot-count:2
(bootloader) current-slot:b
(bootloader) slot-retry-count:b:6
(bootloader) slot-success:b:No
(bootloader) slot-active:b:Yes
(bootloader) slot-unbootable:b:No
(bootloader) slot-retry-count:a:5
(bootloader) slot-success:a:No
(bootloader) slot-active:a:No
(bootloader) slot-unbootable:a:No
(bootloader) has-slot:userdata: No
(bootloader) has-slot:product: Yes
(bootloader) has-slot:frp: No
(bootloader) has-slot:logdump: No
(bootloader) has-slot:dpo: No
(bootloader) has-slot:msadp: No
(bootloader) has-slot:apdp: No
(bootloader) has-slot:keymaster: Yes
(bootloader) has-slot:cmnlib64: Yes
(bootloader) has-slot:cmnlib: Yes
(bootloader) has-slot:lksecapp: Yes
(bootloader) has-slot:mcfg: No
(bootloader) has-slot:syscfg: No
(bootloader) has-slot:mdtp: Yes
(bootloader) has-slot:dip: No
(bootloader) has-slot:mota: No
(bootloader) has-slot:limits: No
(bootloader) has-slot:oem: No
(bootloader) has-slot:config: No
(bootloader) has-slot:prodinfo: No
(bootloader) has-slot:keystore: No
(bootloader) has-slot:misc: No
(bootloader) has-slot:persist: No
(bootloader) has-slot:vendor: Yes
(bootloader) has-slot:system: Yes
(bootloader) has-slot:devinfo: No
(bootloader) has-slot:boot: Yes
(bootloader) has-slot:vbmeta: Yes
(bootloader) has-slot:dtbo: Yes
(bootloader) has-slot:aboot: Yes
(bootloader) has-slot:splash: No
(bootloader) has-slot:sec: No
(bootloader) has-slot:fsg: No
(bootloader) has-slot:DDR: No
(bootloader) has-slot:modemst2: No
(bootloader) has-slot:modemst1: No
(bootloader) has-slot:dsp: Yes
(bootloader) has-slot:devcfg: Yes
(bootloader) has-slot:tz: Yes
(bootloader) has-slot:rpm: Yes
(bootloader) has-slot:sbl1: Yes
(bootloader) has-slot:ssd: No
(bootloader) has-slot:fsc: No
(bootloader) has-slot:modem: Yes
(bootloader) partition-type:userdata:ext4
(bootloader) partition-size:userdata: 0xc2f6f9e00
(bootloader) partition-type:product_b:raw
(bootloader) partition-size:product_b: 0x8000000
(bootloader) partition-type:product_a:raw
(bootloader) partition-size:product_a: 0x8000000
(bootloader) partition-type:frp:raw
(bootloader) partition-size:frp: 0x80000
(bootloader) partition-type:logdump:raw
(bootloader) partition-size:logdump: 0x4000000
(bootloader) partition-type:dpo:raw
(bootloader) partition-size:dpo: 0x2000
(bootloader) partition-type:msadp:raw
(bootloader) partition-size:msadp: 0x40000
(bootloader) partition-type:apdp:raw
(bootloader) partition-size:apdp: 0x40000
(bootloader) partition-type:keymaster_b:raw
(bootloader) partition-size:keymaster_b: 0x100000
(bootloader) partition-type:keymaster_a:raw
(bootloader) partition-size:keymaster_a: 0x100000
(bootloader) partition-type:cmnlib64_b:raw
(bootloader) partition-size:cmnlib64_b: 0x100000
(bootloader) partition-type:cmnlib64_a:raw
(bootloader) partition-size:cmnlib64_a: 0x100000
(bootloader) partition-type:cmnlib_b:raw
(bootloader) partition-size:cmnlib_b: 0x100000
(bootloader) partition-type:cmnlib_a:raw
(bootloader) partition-size:cmnlib_a: 0x100000
(bootloader) partition-type:lksecapp_b:raw
(bootloader) partition-size:lksecapp_b: 0x20000
(bootloader) partition-type:lksecapp_a:raw
(bootloader) partition-size:lksecapp_a: 0x20000
(bootloader) partition-type:mcfg:raw
(bootloader) partition-size:mcfg: 0x400000
(bootloader) partition-type:syscfg:raw
(bootloader) partition-size:syscfg: 0x80000
(bootloader) partition-type:mdtp_b:raw
(bootloader) partition-size:mdtp_b: 0x2000000
(bootloader) partition-type:mdtp_a:raw
(bootloader) partition-size:mdtp_a: 0x2000000
(bootloader) partition-type:dip:raw
(bootloader) partition-size:dip: 0x100000
(bootloader) partition-type:mota:raw
(bootloader) partition-size:mota: 0x80000
(bootloader) partition-type:limits:raw
(bootloader) partition-size:limits: 0x8000
(bootloader) partition-type:oem:raw
(bootloader) partition-size:oem: 0x10000000
(bootloader) partition-type:config:raw
(bootloader) partition-size:config: 0x8000
(bootloader) partition-type:prodinfo:raw
(bootloader) partition-size:prodinfo: 0x200000
(bootloader) partition-type:keystore:raw
(bootloader) partition-size:keystore: 0x80000
(bootloader) partition-type:misc:raw
(bootloader) partition-size:misc: 0x100000
(bootloader) partition-type:persist:raw
(bootloader) partition-size:persist: 0x2000000
(bootloader) partition-type:vendor_b:raw
(bootloader) partition-size:vendor_b: 0x40000000
(bootloader) partition-type:vendor_a:raw
(bootloader) partition-size:vendor_a: 0x40000000
(bootloader) partition-type:system_b:raw
(bootloader) partition-size:system_b: 0xc0000000
(bootloader) partition-type:system_a:raw
(bootloader) partition-size:system_a: 0xc0000000
(bootloader) partition-type:devinfo:raw
(bootloader) partition-size:devinfo: 0x100000
(bootloader) partition-type:boot_b:raw
(bootloader) partition-size:boot_b: 0x4000000
(bootloader) partition-type:boot_a:raw
(bootloader) partition-size:boot_a: 0x4000000
(bootloader) partition-type:vbmeta_b:raw
(bootloader) partition-size:vbmeta_b: 0x10000
(bootloader) partition-type:vbmeta_a:raw
(bootloader) partition-size:vbmeta_a: 0x10000
(bootloader) partition-type:dtbo_b:raw
(bootloader) partition-size:dtbo_b: 0x800000
(bootloader) partition-type:dtbo_a:raw
(bootloader) partition-size:dtbo_a: 0x800000
(bootloader) partition-type:aboot_b:raw
(bootloader) partition-size:aboot_b: 0x300000
(bootloader) partition-type:aboot_a:raw
(bootloader) partition-size:aboot_a: 0x300000
(bootloader) partition-type:splash:raw
(bootloader) partition-size:splash: 0xb00000
(bootloader) partition-type:sec:raw
(bootloader) partition-size:sec: 0x4000
(bootloader) partition-type:fsg:raw
(bootloader) partition-size:fsg: 0x180000
(bootloader) partition-type:DDR:raw
(bootloader) partition-size:DDR: 0x8000
(bootloader) partition-type:modemst2:raw
(bootloader) partition-size:modemst2: 0x180000
(bootloader) partition-type:modemst1:raw
(bootloader) partition-size:modemst1: 0x180000
(bootloader) partition-type:dsp_b:raw
(bootloader) partition-size:dsp_b: 0x1000000
(bootloader) partition-type:dsp_a:raw
(bootloader) partition-size:dsp_a: 0x1000000
(bootloader) partition-type:devcfg_b:raw
(bootloader) partition-size:devcfg_b: 0x40000
(bootloader) partition-type:devcfg_a:raw
(bootloader) partition-size:devcfg_a: 0x40000
(bootloader) partition-type:tz_b:raw
(bootloader) partition-size:tz_b: 0x200000
(bootloader) partition-type:tz_a:raw
(bootloader) partition-size:tz_a: 0x200000
(bootloader) partition-type:rpm_b:raw
(bootloader) partition-size:rpm_b: 0x80000
(bootloader) partition-type:rpm_a:raw
(bootloader) partition-size:rpm_a: 0x80000
(bootloader) partition-type:sbl1_b:raw
(bootloader) partition-size:sbl1_b: 0x80000
(bootloader) partition-type:sbl1_a:raw
(bootloader) partition-size:sbl1_a: 0x80000
(bootloader) partition-type:ssd:raw
(bootloader) partition-size:ssd: 0x2000
(bootloader) partition-type:fsc:raw
(bootloader) partition-size:fsc: 0x400
(bootloader) partition-type:modem_b:raw
(bootloader) partition-size:modem_b: 0x5800000
(bootloader) partition-type:modem_a:raw
(bootloader) partition-size:modem_a: 0x5800000
(bootloader) hw-revision:10000
(bootloader) serialno:A209J2080202
(bootloader) kernel:lk
(bootloader) product:FP3
all:
finished. total time: 1.995s

output fastboot getvar curent-slot
curent-slot:
finished. total time: 0.020s

output lsusb
Bus 001 Device 067: ID 18d1:d00d Google Inc.

Thanks for your information and spending time. Have a nice weekend,
Joseph