• Blazing 4.2mb/s speed
• exFAT Support
• external HDD, SSD, USB Drives up to 2TB
• Lower power consumption by 45% ( No more overheating ( heatsink still recommended ) )

• A5-V11 3G/4G (You must have 4MB Flash / 32MB RAM)
• USB Drive in Fat32 (to flash Router once)
• USB Drive in exFAT (to run backups)

-Transfer lede-ramips-rt305x-a5-v11-squashfs-sysupgrade.bin and uboot_usb_256_03.img to a root FAT32 USB, plug USB into router
-Install PuTTY
-Plug Router to PC, connect via Putty with these connection settings: 192.168.100.1 / 23 / Telnet, press Connect

-Login admin, Password admin (blind input)
-Type comands, 1 by 1:

ls /media/sda1/

mtd_write write /media/sda1/uboot_usb_256_03.img Bootloader

mtd_write write /media/sda1/lede-ramips-rt305x-a5-v11-squashfs-sysupgrade.bin Kernel

reboot

Correct output:

-Open Browser 192.168.1.1
(it take about 2 min to reboot)
-Login(no password) --> Go to Password Configuraion --> Password admin --> Confirmation admin --> interface LAN --> Save and Apply

-Disconnect micro usb from Router, eject FAT32 USB, inject exFAT USB, connect micro usb
-Go to 192.168.1.1, Log in, System --> Mount Points --> check that your exFAT USB drive is detected on /dev/sda1

-Router is Done!

-Flash OpenWRT_17.01.7_MX25L3205.bin via CH341A or any compatible BIOS programmer
-Router is Done!

-Format USB to GUID Partition Table (GPT), exFat, Standart Cluster Size
(I highly recommend using GParted Live USB or Rufus over Windows formatting)
-Do standart USB config for PS2 (create CD/DVD folders, add backups, ARTs, e.t.c.)

• FAT32 USB Drive
• 8MB MemoryCard (orig or clone, 64mb and more not supported)
• Ability to run ulaunchELF

-Place FMCB-OPENTUNA folder into root FAT32 USB Drive, insert into PS2
-Run uLaunchELF
-Run mass:/FMCB-OPENTUNA/FMCBInstaller.elf
Make sure that the correct MC is inserted into PS2 slot 1, slot 2 is empty
-Restore MC ( Press R1 R1 Down Down X ), Confirm
(careful, it will format your MemoryCard)
-Install FMCB Multi-install ( Press L1 L1 Down X ), Confirm
-Exit, Reboot PS2, Eject USB from PS2

This will install the latest FMCB and OPENTUNA on one card. FMCB automatically launches uLaunchELF, which launches OPL with a perfectly calculated timer to ensure the router has time to boot, if youre power router from PS2 USB. If you have a PS2 90000, or your MC is a clone, you can run the OpenTuna exploit, which then does the same. To open the FMCB menu, hold the triangle while turning on your PS2 until the menu appears.
This combination of Apps should work on most (if not all) Slim PS2

-Place OPNPS2LD-v1.2.0-Beta-1973-88079d7-UDPBD.elf into bootable memory card
-Delete/archive opl .cfg files, there are stored in:
mc0:/OPL/conf_network.cfg
mc0:/OPL/conf_opl.cfg
-Make this version of OPL apperable on FMCB/Funtuna menu or config to autoboot this version of OPL
-Remove any USB Drive from PS2 (important!)
-Connect power to the router, having first connected the LAN to PS2 and USB Drive to Router
-Run OPNPS2LD..UDPBD.elf
Settings->BDM Start Mode->Manual
Settings->Default Menu->BDM Games->OK->Save Changes

-Place the contents of psxmemcard.zip in the root of your SD2PSX / PSXMemCard Gen2 / PSXMemCard Gen1 / PicoMemcard+

-Router take 30 seconds to start and init drive. Please wait 1 minute in FMCB Menu before start OPL or press Start ->Exit -> (run OPL again).

-You cannot use any other version of OPL, UDPBD works only in this specific version.

-Connect USB to router Before power on, eject USB after power off. there is no Plug-in-play, all scripts run once its starts.

-If USB drive is connected to the PS2 while OPL is running, UDPBD will not start.

-I disable WiFi and disable unsoldered LANs to reduce power consumption, but it still strongly recommend:

• Heatsink on Ralink Chip

• Hardmod MAX809TTR / ADM809 (Router doesn't always turn on after hard reboot, Without this, the router needs to leave without power for 5 seconds so that it starts up normally and does not freeze at boot.)

-If you don't see the list of games, first try setting up UDPBD with configured USB on your PC

-System does not have Plug-and-play feature. inject USB Drive before power on and eject after power off.

-keepalive.txt file will be created on your flash drive. This is not a bug, but a feature-prevent USB HDD drives from parking.

I use Ubuntu 16 to build OpenWRT (the latest version, 24, doesn't work). This is OpenWRT 17.01.7, built via Buildroot. You can see the assembly instructions here:
Начальная инструкция с картинками. Метод сборки через Buildroot
then replace .config and place files folder in your OpenWRT directory