TP-LINK Archer BE700/Serial info

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UART shell outputs • >>
The line below, default_support_password=Support!, suggests 
:there may be a backdoor for "support". I could be wrong.

version
 U-Boot 2019.07 (May 29 2024 - 09:34:57 +0800), Build: 50404p2@450432
 aarch64-linux-gcc.br_real (Buildroot 2021.02.4) 10.3.0
 GNU ld (GNU Binutils) 2.36.1

mtdparts
 device nand0 <spi1.0>, # parts = 4
 #: name                size            offset          mask_flags
 0: loader              0x00200000      0x00000000      0
 1: image               0x07280000      0x00200000      0
 2: tpconfig            0x00380000      0x07480000      0
 3: userconfig          0x00700000      0x07800000      0
 active partition: nand0,0 - (loader) 0x00200000 @ 0x00000000
 defaults:
 mtdids  : nand0=spi1.0
 mtdparts: spi1.0:2097152(loader)

coninfo
 List of available devices:
 serial0  00000007 IO stdin stdout stderr 
 serial   00000003 IO

bdinfo
 arch_number = 0x0000000000000000
 boot_params = 0x0000000000000000
 DRAM bank   = 0x0000000000000000
 -> start    = 0x0000000000000000
 -> size     = 0x0000000040000000
 baudrate    = 115200 bps
 TLB addr    = 0x000000003ffe0000
 relocaddr   = 0x000000003fdb0000
 reloc off   = 0x000000003edb0000
 irq_sp      = 0x000000003dd9e050
 sp start    = 0x000000003dd9e050
 Early malloc usage: f00 / 8000
 fdt_blob    = 0x000000003dd9e060

mmcinfo
 Card did not respond to voltage select!

printenv
 IMAGE=NAND:2M,1024M
 MCB=0xc0121535
 boardid=TPBE700SP2
 bootargs_append=cma=52M
 bootcmd=printenv;run once;sdk boot_img
 bootdelay=1
 bufmem=128M
 default_support_password=Support!
 default_user_password=User!
 dhd0=11
 env_boot_magic=16384@0x80000,0x140000,0x1a0000
 ethact=systemport@0x80210000
 ethaddr=68:7F:F0:08:D6:7B
 fdtaddr=7f73000
 fdtcontroladdr=3dd9e060
 filesize=4
 ipaddr=192.168.0.1
 mtdids=nand0=spi1.0
 mtdparts=spi1.0:2097152(loader),120061952@2097152(image),
 3670016@122159104(tpconfig),7340032@125829120(userconfig)
 netmask=255.255.255.0
 nummacaddrs=10
 once=true
 rnrmem=13
 rootfs_opts=root=/dev/ubiblock0_4 ubi.mtd=image ubi.block=0,4 rootfstype=squashfs
 stderr=serial0
 stdin=serial0
 stdout=serial0
 Environment size: 702/8188 bytes

pinmux list
 | Device                        | Driver                        | Parent
 | pinctrl                       | bcmbca_pinctrl                | periph

showvar
 showvar
 HUSH_VERSION=0.01