Reticently i soldered my Tplink Tl-wr741nd V4
I followed the guide here
https://forum.openwrt.org/viewtopic.php?id=37368
Unfortunately 15k and 10 k resistors didn't worked for me, i got debounce errors repeatedly, so i detached resistors
D+ and D- directly goes to USB 2.0 Hub Which is powered by LM7805

Firmware: You must compile yourself, or download a modified version here https://forum.openwrt.org/viewtopic.php?id=37368

(Last edited by Shahid on 3 Nov 2015, 04:19)

You shouldn't create another thread for the same thing, this way spreads the information and makes it harder to find.
Please put this on the original thread..
Too long wires everywhere. The power regulator 7805 should be placed close to the power application, and it will heat a lot if you plug anything else than a low power USB device, like a hard disk of various usb sticks.
500mA, the standard for high speed USB 2.0 devices, will dissipate 3.5W of power on that little regulator , will heat up and burn.
And if they are two or more devices, even more problems.You need a proper cooling solution, like a heatsink.
Also you need a capacitor in the input and output to avoid voltage oscillations than can make strange things.

So don't tell that it's my design problem when you've done a crappy job!

By the way, nice idea on putting a usb hub.

(Last edited by dabyd64 on 3 Nov 2015, 15:21)

Good News for everyone, No more compilation required
recently i discovered TL-MR3220 v2 & TL-WR741 v4 Both uses AR9331 CPU
I have successfully tried these firmwares in my TL-WR741ND V4
15.05 Chaos Calmer https://downloads.openwrt.org/chaos_cal … pgrade.bin
14.07 Barrier Breaker https://downloads.openwrt.org/barrier_b … pgrade.bin
Install using mtd and force it

Everything just works fine
USB is working great with no errors at all
Install these packages if you want to mount usb storage
kmod-usb-storage-extras kmod-fs-vfat kmod-fs-ext4

Install these packages to enable tether your 3G and 4G USB dongles and Android tethering
usb-modeswitch kmod-usb-net-rndis kmod-usb-net-cdc-ether kmod-usb-net

For mounting your USB as rootfs or  extroot http://wiki.openwrt.org/doc/howto/extroot

Can you tell us more how you made this modification?

RB750 USB Mod
https://forum.openwrt.org/viewtopic.php?id=61127

(Last edited by Shahid on 25 Nov 2015, 00:31)

Thanks for your reply. But I thought, you write about converting TL-WR842ND V2 into mikrotik.

that is impossible for now. TL-WR842ND V2 has only 8M nand, mikrotik needs a lot bigger storage

Hi! I install firmware from your post and have some questions:)  How you install additional packages? When i try install kmod-usb-storage-extras, kmod-fs-ext4, i have error "No space left on device.".

photo my usb mod:
postimg.org/image/ilq0vybfz/
postimg.org/image/68d6olj27/

Thanks!

(Last edited by sergey_derepa on 30 Dec 2017, 22:32)