Help with booting Pogo V4 (no replies)

For a long time now, I've been using a Pogoplug v4 with an 80GB HDD as boot drive and a 2TB drive as a personal NAS (ArchLinux). Since like a year ago, I couldn't update ArchLinux anymore and I didn't give myself the time to see why (and try to fix it) as my NAS was always available. A couple of weeks ago I decided to upgrade my 2TB drive with a 4TB one, and before I swapped it I started poking around my device until I almost bricked it. Luckily I had a USB-to UART adapter lying around from another time I almost bricked it and managed to fix it with such adapter.

As I was trying to reflash my unit with the latest kwboot (uboot.2017.07-tld-1.pogo_v4.mtd0.kwb) following the instructions I found at CloudEngines Pogoplug v4/mobile as it was the most comprehensive guide I could find, I did manage to flash the kwb onto the device, but as I went on, It seems I messed up all my environment variables and now I can't get past the "pogoplugv4>" prompt (only by interrupting the boot process. Here's my bootlog:

# kwboot -t -B 115200 /dev/ttyUSB0 -b uboot.2017.07-tld-1.pogo_v4.mtd0.kwb -p pogoV4_basic.patch
Sending boot message. Please reboot the target...-
Sending boot image...
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[Type Ctrl-\ + c to quit]


U-Boot 2017.07-tld-1 (Sep 05 2017 - 00:34:01 -0700)
Pogoplug V4

SoC:   Kirkwood 88F6192_A1
DRAM:  128 MiB
WARNING: Caches not enabled
NAND:  128 MiB
MMC:   MVEBU_MMC: 0
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   egiga0
Hit any key to stop autoboot:  0 
starting USB...
USB0:   USB EHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found

Reset IDE: ide_preinit failed
Card did not respond to voltage select!
mmc_init: -95, time 14
## Unknown partition table type 0

## Unknown partition table type 0

## Unknown partition table type 0

## Unknown partition table type 0

## Unknown partition table type 0

## Unknown partition table type 0

## Unknown partition table type 0
loading envs from usb 0 ...
** Bad device usb 0 **

no IDE devices available
Card did not respond to voltage select!
mmc_init: -95, time 14
running scan_disk ...
Scan device usb
device usb 0:1
** Bad device usb 0 **
device usb 1:1
** Bad device usb 1 **
device usb 2:1
** Bad device usb 2 **
device usb 3:1
** Bad device usb 3 **
Scan device ide

Reset IDE: ide_preinit failed
device ide 0:1
** Bad device ide 0 **
device ide 1:1
** Bad device ide 1 **
device ide 2:1
** Bad device ide 2 **
device ide 3:1
** Bad device ide 3 **
Scan device mmc
Card did not respond to voltage select!
mmc_init: -95, time 14
device mmc 0:1
Card did not respond to voltage select!
mmc_init: -95, time 14
Card did not respond to voltage select!
mmc_init: -95, time 14
** Bad device mmc 0 **
device mmc 1:1
MMC Device 1 not found
MMC Device 1 not found
** Bad device mmc 1 **
device mmc 2:1
MMC Device 2 not found
MMC Device 2 not found
** Bad device mmc 2 **
device mmc 3:1
MMC Device 3 not found
MMC Device 3 not found
** Bad device mmc 3 **
loading uImage ...
** Bad device usb 0 **
loading uInitrd ...
** Bad device usb 0 **
loading DTB /boot/dts/kirkwood-pogoplug_v4 ...
** Bad device usb 0 **
Unknown command 'bootm0x800000' - try 'help'
resetting ...


U-Boot 2020.04 (Sep 22 2020 - 18:58:26 +0000)
Pogoplug V4

SoC:   Kirkwood 88F6281_A1
DRAM:  128 MiB
NAND:  128 MiB
MMC:   
Loading Environment from NAND... OK
In:    serial
Out:   serial
Err:   serial
Net:   egiga0
Hit any key to stop autoboot:  0 
pogoplugv4>

And here my environment variables:

pogoplugv4> printenv
baudrate=115200
bootcmd=ubi part ubi; ubi read 0x800000 kernel; bootm 0x800000
bootcmd_exec=run load_uimage; if run load_initrd; then if run load_dtb; then bootm $load_uimage_addr $load_initrd_addr $load_dtb_addr; else bootm $load_uimage_addr $load_initrd_addr; fi; else if run load_dtb; then bootm $load_uimage_addr - $load_dtb_addr; else bootm
bootdelay=3
bootdev=$dev
console=console=ttyS0,115200
device=$disknum:1
ethact=egiga0
ethaddr=00:25:31:05:F9:62
led_errorsetenv=load_dtb_addr 0x1c00000
load_dtb=g DTB $dtb_file ...
load_initd_initrd_addr=/boot/uInitrd
load_uimage=...
machid=0ion_nand
mtdids=nand0=orion_nand
mtdparts=mtdparts=orion_nand:0x1c0000(uboot),0x40000(uboot_env),0x7e00000(ubi)
partitioneboot_nc=run if_netconsole start_netconsole
scan_disk_disk=...
scan_ide="ide reset"
scan_mmc="mmc rescan"
scan_usb="usb start"
stderr=serial
stdin=serial
stdout=serial
uenv_loaded=0
uenv_read=mtdparts=orion_nand:2M(u-boot),3M(uImage),3M(uImage2),8M(failsafe),112M(root)

Environment size: 980/131068 bytes
pogoplugv4>

The computer I'm connecting to the Pogoplug from is a Windows laptop with a Debian (10.5.0 x64) VirtualBox, and I'm running all the process from the Debian virtual machine.

As I'm no Linux expert I'm 100% sure I'm making a beginner's mistake, but I can't find a step by step tutorial to get out of this mess.

Any help would be greatly appreciated.

Thanks in advance.

Manuel Orbezo