Well, I just tried a snapshot I did today and it bricked my device. I just connected a UART cable, as you can see it is using Kernel 5.10.92 and just hangs at "Starting kernel ..." with no further error.
I will now try to recover this device and definitively I will stay away from Kernel 5.10 on the Archer C6 v3 devices until it is included in stable build... 
U-Boot 1.1.3 (May 13 2020 - 19:39:06)
Board: Ralink APSoC DRAM: 128 MB
relocate_code Pointer at: 87f58000
Config XHCI 40M PLL
flash manufacture id: c8, device id 40 18
find flash: GD25Q128C
*** Warning - bad CRC, using default environment
============================================
Ralink UBoot Version: 5.0.0.0
--------------------------------------------
ASIC MT7621A DualCore (MAC to MT7530 Mode)
DRAM_CONF_FROM: Auto-Detection
DRAM_TYPE: DDR3
DRAM bus: 16 bit
Xtal Mode=3 OCP Ratio=1/3
Flash component: SPI Flash
Date:May 13 2020 Time:19:39:06
============================================
THIS IS uboot
icache: sets:256, ways:4, linesz:32 ,total:32768
dcache: sets:256, ways:4, linesz:32 ,total:32768
##### The CPU freq = 880 MHZ ####
estimate memory size =128 Mbytes
Press '4' or 't' to break the booting process
Press 'x' to enter recovery web server 0
nm_init:791
nm_initFwupPtnStruct:276
nm_lib_readPtnTable:738
[NM_Debug](nm_lib_readPtnTable) 00743: NM_PTN_TABLE_BASE = 0xfe0000
[NM_Debug](nm_lib_readPtnFromNvram) 00569: partition_used_len = 1054, requried l en = 8192
[NM_Debug](nm_lib_readPtnTable) 00751: Reading Partition Table from NVRAM ... OK
[NM_Debug](nm_lib_readPtnTable) 00759: Parsing Partition Table ... OK
[NM_Debug](nm_lib_readPtnFromNvram) 00569: partition_used_len = 2, requried len = 2
factory boot check integer ok.
3: System Boot system code via Flash.
## Booting image at bc040000 ...
Image Name: MIPS OpenWrt Linux-5.10.92
Image Type: MIPS Linux Kernel Image (lzma compressed)
Data Size: 2731273 Bytes = 2.6 MB
Load Address: 82000000
Entry Point: 82000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
No initrd
## Transferring control to Linux (at address 82000000) ...
## Giving linux memsize in MB, 128
Starting kernel ...