fastboot mode. Info 
Device connected in fastboot mode 
(bootloader) unlocked:no
(bootloader) off-mode-charge:1
(bootloader) user-uart-enabled:0
(bootloader) charger-screen-enabled:1
(bootloader) battery-soc-ok:yes
(bootloader) battery-voltage:3730
(bootloader) version-baseband:
(bootloader) version-bootloader:
(bootloader) variant:SDM EMMC
(bootloader) partition-type:userdata:ext4
(bootloader) partition-size:userdata: 0xC437FBE00
(bootloader) partition-type:system_b:ext4
(bootloader) partition-size:system_b: 0xC0000000
(bootloader) has-slot:modem:yes
(bootloader) has-slot:system:yes
(bootloader) current-slot:b
(bootloader) has-slot:boot:yes
(bootloader) slot-retry-count:b:6
(bootloader) slot-unbootable:b:no
(bootloader) slot-successful:b:yes
(bootloader) slot-retry-count:a:6
(bootloader) slot-unbootable:a:no
(bootloader) slot-successful:a:yes
(bootloader) slot-count:2
(bootloader) secure:no
(bootloader) serialno:bc8d878
(bootloader) product:QC_Reference_Phone
(bootloader) max-download-size:536870912
(bootloader) kernel:uefi
all: 
Finished. Total time: 0.005s

Downloading QCN file : D:\JVC J20.qcn