How to "unbrick" Mijia Robot Vacuum-Mop 3C?

[lime-sklad]

please help. I flashed Mijia Robot Vacuum-Mop 3C via the mindsolo website. There was version 4.3.3_0025. Updated to 4.1.8_0002 (testing)

After 20 minutes, I closed mihome on my phone and now the vacuum cleaner neither turns on nor turns off, I tried holding home start at the same time, it does not respond.

On the back side, under the cover near the battery, there is a micro connector, connecting it to the computer using fastboot, I got the following information:

C:\Users\Admin\Desktop\platform-tools>fastboot devices  
396932SD2303C01531       fastboot 

AND

C:\Users\Admin\Desktop\platform-tools>fastboot getvar all
(bootloader) version:0.4
(bootloader) version-bootloader:U-Boot 2017.09-g8886bdd-dirty
(bootloader) version-baseband:N/A
(bootloader) product:evb_rk3308
(bootloader) serialno:396932SD2303C01531
(bootloader) secure:yes
(bootloader) max-download-size:0x04000000
(bootloader) logical-block-size:0x200
(bootloader) erase-block-size:0xffffffff
(bootloader) partition-type:uboot:U-Boot
(bootloader) partition-type:trust:U-Boot
(bootloader) partition-type:security:U-Boot
(bootloader) partition-type:misc:U-Boot
(bootloader) partition-type:boot_a:U-Boot
(bootloader) partition-type:boot_b:U-Boot
(bootloader) partition-type:system_a:U-Boot
(bootloader) partition-type:system_b:U-Boot
(bootloader) partition-type:vbmeta_a:U-Boot
(bootloader) partition-type:vbmeta_b:U-Boot
(bootloader) partition-type:userdata:U-Boot
(bootloader) partition-size:uboot:0x200000
(bootloader) partition-size:trust:0x200000
(bootloader) partition-size:security:0x200000
(bootloader) partition-size:misc:0x100000
(bootloader) partition-size:boot_a:0xa00000
(bootloader) partition-size:boot_b:0xa00000
(bootloader) partition-size:system_a:0x2600000
(bootloader) partition-size:system_b:0x2600000
(bootloader) partition-size:vbmeta_a:0x100000
(bootloader) partition-size:vbmeta_b:0x100000
(bootloader) partition-size:userdata:0x617be00
(bootloader) unlocked:no
(bootloader) off-mode-charge:not implemented
(bootloader) battery-voltage:not implemented
(bootloader) variant:userdebug
(bootloader) battery-soc-ok:no
(bootloader) is-userspace:no
(bootloader) slot-count:2
(bootloader) has-slot:uboot:no
(bootloader) has-slot:trust:no
(bootloader) has-slot:security:no
(bootloader) has-slot:misc:no
(bootloader) has-slot:boot:yes
(bootloader) has-slot:system:yes
(bootloader) has-slot:vbmeta:yes
(bootloader) has-slot:userdata:no
(bootloader) current-slot:a
(bootloader) slot-suffixes:a,b
(bootloader) slot-successful:a:no
(bootloader) slot-successful:b:no
(bootloader) slot-unbootable:a:yes
(bootloader) slot-unbootable:b:yes
(bootloader) slot-retry-count:a:0
(bootloader) slot-retry-count:b:0

There is a working vacuum cleaner of the same model, but if you connect it in the same way, the computer does not see it and fastboot commands do not work. In general, if you have any ideas, please help.