CMD log

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot boot \Jelly2A10\recovery.img
fastboot: error: cannot load '\Jelly2A10\recovery.img': No such file or directory

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot boot Jelly2A10\recovery.img
Sending 'boot.img' (24508 KB)                      OKAY [  1.492s]
Booting                                            FAILED (Status read failed (Too many links))
fastboot: error: Command failed

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>adb devices
List of devices attached


I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot devices
JELLY20000015140        fastboot

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot boot Jelly2A10\recovery.img
Sending 'boot.img' (24508 KB)                      OKAY [  1.755s]
Booting                                            FAILED (remote: 'Unrecognized command boot')
fastboot: error: Command failed

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot boot Jelly2A11\magisk_patched-23000_WvfX8.img
Sending 'boot.img' (32768 KB)                      OKAY [  2.374s]
Booting                                            FAILED (remote: 'Unrecognized command boot')
fastboot: error: Command failed

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot boot Jelly2A11\magisk_patched-23000_WvfX8.img
Sending 'boot.img' (32768 KB)                      OKAY [  1.903s]
Booting                                            FAILED (Status read failed (Too many links))
fastboot: error: Command failed

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>adb sideload 2021111019_g55v71c2k_dfl_tee-ota.zip
adb: sideload connection failed: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.
adb: trying pre-KitKat sideload method...
adb: pre-KitKat sideload connection failed: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>adb kill-server

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>adb sideload 2021111019_g55v71c2k_dfl_tee-ota.zip
* daemon not running; starting now at tcp:5037
* daemon started successfully
adb: sideload connection failed: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.
adb: trying pre-KitKat sideload method...
adb: pre-KitKat sideload connection failed: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
Try 'adb kill-server' if that seems wrong.
Otherwise check for a confirmation dialog on your device.

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot boot Jelly2A11\magisk_patched-23000_WvfX8.img
< waiting for any device >
^C
I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>adb sideload 2021111019_g55v71c2k_dfl_tee-ota.zip
adb: sideload connection failed: no devices/emulators found
adb: trying pre-KitKat sideload method...
adb: pre-KitKat sideload connection failed: no devices/emulators found

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot devices
JELLY20000015140        fastboot

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot flash recovery Jelly2A10\recovery.img
Sending 'recovery' (24508 KB)                      OKAY [  1.705s]
Writing 'recovery'                                 OKAY [  0.109s]
Finished. Total time: 2.080s

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows> fastboot reboot recovery
Rebooting into recovery                            OKAY [  0.000s]
Finished. Total time: 0.000s

I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>fastboot devices


I:\My Files  + Data\Unihertz Jelly 2\[ADB] platform-tools_r31.0.3-windows>adb sideload 2021111019_g55v71c2k_dfl_tee-ota.zip