I tried the bin file from pepo73_ORANGE.zip in thread OpenWrt installation on MR200 flybox orange, but it didn´t worked. The good thing is that the tftp is still OK.
Output from the serial interface. It´s stops at [ 14.894853] random: crng init done
[03080D0B][03080D09][88890000][24254849][00242548]
DU Setting Cal Done
U-Boot 1.1.3 (Feb 1 2021 - 18:08:24)
Board: Ralink APSoC DRAM: 64 MB
relocate_code Pointer at: 83fb4000
cpuType 00000000.
cpuType 00000000.
gpiomode1 55154404.
gpiomode2 05550555.
######GPIO CTRL 0 for GPIO 0~31 OUTPUT tmp(0x00000030)#####
######GPIO CTRL 1 for GPIO 32~64 OUTPUT tmp(0x00000f80)#####
######GPIO CTRL 1 for GPIO 32~64 INPUT tmp(0x00000f80)#####
flash manufacture id: ef, device id 40 17
find flash: W25Q64BV
RALINK_GPIOMODE_REG_1(0xb0000060) old=0x55154404 new=0x55154404
RALINK_GPIO_CTRL_32_63(0xb0000604) old=0xf80 new=0xf90
RALINK_GPIO_DATA_32_63(0xb0000624) old=0x6f1f new=0x6f0f
============================================
Ralink UBoot Version: 4.3.0.0
--------------------------------------------
ASIC 7628_MP (Port5<->None)
DRAM component: 512 Mbits DDR, width 16
DRAM bus: 16 bit
Total memory: 64 MBytes
Flash component: SPI Flash
Date:Feb 1 2021 Time:18:08:24
============================================
icache: sets:512, ways:4, linesz:32 ,total:65536
dcache: sets:256, ways:4, linesz:32 ,total:32768
##### The CPU freq = 580 MHZ ####
estimate memory size =64 Mbytes
RESET MT7628 PHY!!!!!!..................................................
starting recovery...
TODO, Read MAC Address from Flash
netboot_common, argc= 3
NetTxPacket = 0x83FE4200
KSEG1ADDR(NetTxPacket) = 0xA3FE4200
NetLoop,call eth_halt !
NetLoop,call eth_init !
Trying Eth0 (10/100-M)
Waitting for RX_DMA_BUSY status Start... done
ETH_STATE_ACTIVE!!
TFTP from server 192.168.0.225; our IP address is 192.168.0.2
Filename 'tp_recovery.bin'.
TIMEOUT_COUNT=10,Load address: 0x80060000
Loading: checksum bad
checksum bad
Got ARP REPLY, set server/gtwy eth addr (00:0a:cd:13:46:06)
Got it
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
###############################################checksum bad
#########checksum bad
#########
#################################################################
#################################################################
#checksum bad
################################################################
#################################################################
########################
done
Bytes transferred = 5112072 (4e0108 hex)
NetBootFileXferSize= 004e0108
Erase flash !!
From 0x20000 length 0x7A0000
..........................................................................................................................
Copy 0x80080000 to 0x00020000, count 0x7A0000....
..........................................................................................................................
[03080D0B][03080D09][88890000][24244748][00242447]
DU Setting Cal Done
U-Boot 1.1.3 (Feb 1 2021 - 18:08:24)
Board: Ralink APSoC DRAM: 64 MB
relocate_code Pointer at: 83fb4000
******************************
Software System Reset Occurred
******************************
cpuType 00000000.
cpuType 00000000.
gpiomode1 55154404.
gpiomode2 05550555.
######GPIO CTRL 0 for GPIO 0~31 OUTPUT tmp(0x00000030)#####
######GPIO CTRL 1 for GPIO 32~64 OUTPUT tmp(0x00000f80)#####
######GPIO CTRL 1 for GPIO 32~64 INPUT tmp(0x00000f80)#####
flash manufacture id: ef, device id 40 17
find flash: W25Q64BV
RALINK_GPIOMODE_REG_1(0xb0000060) old=0x55154404 new=0x55154404
RALINK_GPIO_CTRL_32_63(0xb0000604) old=0xf80 new=0xf90
RALINK_GPIO_DATA_32_63(0xb0000624) old=0x6f5f new=0x6f4f
============================================
Ralink UBoot Version: 4.3.0.0
--------------------------------------------
ASIC 7628_MP (Port5<->None)
DRAM component: 512 Mbits DDR, width 16
DRAM bus: 16 bit
Total memory: 64 MBytes
Flash component: SPI Flash
Date:Feb 1 2021 Time:18:08:24
============================================
icache: sets:512, ways:4, linesz:32 ,total:65536
dcache: sets:256, ways:4, linesz:32 ,total:32768
##### The CPU freq = 580 MHZ ####
estimate memory size =64 Mbytes
RESET MT7628 PHY!!!!!!
continue to starting system. 0
disable switch phyport...
3: System Boot system code via Flash.(0xbc020000)
do_bootm:argc=2, addr=0xbc020000
## Booting image at bc020000 ...
Uncompressing Kernel Image ... OK
No initrd
## Transferring control to Linux (at address 80000000) ...
## Giving linux memsize in MB, 64
Starting kernel ...
[ 0.000000] Linux version 4.14.241 (builder@buildhost) (gcc version 7.5.0 (OpenWrt GCC 7.5.0 r11364-ef56c85848)) #0 Thu Jul 29 19:50:28 2021
[ 0.000000] Board has DDR2
[ 0.000000] Analog PMU set to hw control
[ 0.000000] Digital PMU set to hw control
[ 0.000000] SoC Type: MediaTek MT7628AN ver:1 eco:2
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 00019655 (MIPS 24KEc)
[ 0.000000] MIPS: machine is TP-Link Archer MR200
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 04000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] random: get_random_bytes called from 0x80485740 with crng_init=0
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: console=ttyS0,115200 rootfstype=squashfs,jffs2
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Writing ErrCtl register=0003af70
[ 0.000000] Readback ErrCtl register=0003af70
[ 0.000000] Memory: 58804K/65536K available (3930K kernel code, 185K rwdata, 504K rodata, 1196K init, 215K bss, 6732K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 256
[ 0.000000] CPU Clock: 580MHz
[ 0.000000] clocksource: systick: mask: 0xffff max_cycles: 0xffff, max_idle_ns: 583261500 ns
[ 0.000000] systick: enable autosleep mode
[ 0.000000] systick: running - mult: 214748, shift: 32
[ 0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6590553264 ns
[ 0.000010] sched_clock: 32 bits at 290MHz, resolution 3ns, wraps every 7405115902ns
[ 0.007524] Calibrating delay loop...
[ 14.803351] random: fast init done
[ 14.894853] random: crng init done