Got an error while installing new firmware, now sonoff mini r2 won't turn on

[MSupreme1990]

Hi! Through api installed firmware fullhaaboot.bin, got an error
[error] 9#9: *2 open() "/opt/www/file-browser/api/device/otaFlash" failed (2: No such file or directory), client: 172.17.0.1, server: localhost, request: "POST /api/device/otaFlash HTTP/1.1", host: "192.168.0.117:8000"

now the device does not turn on, the diode does not light up, does not respond to pressing the button, what should I do?

[rtek1000]

https://hobbytronics.com.pk/sonoff-original-firmware-backup-restore/