Shulou(Shulou.com)05/31 Report--

How to change TP-Link WR841N V8 brush breed and Open, I believe that many inexperienced people do not know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Found the old router and wanted to browse OpenWrt.

But the version is the WR841N v8 version of TP-Link. Only after looking it up on the Internet can we know that it is a severely shrunk version specifically for domestic release.

The international version of Flash is 4m, the memory RAM is 32m, and the domestic version is 2M/16M, but some people on the forum also said that the Flash is 4m.

(v8 China version of OpenWrt's official website)

Open the lid and have a look at your luck. Sure enough, Flash is cF-EON 2m's Q16Grader A3S28D40FTP, and I still admire the technical staff of TP. They have reached the point where they can really squeeze a routing system (also Linux) into 2m's Flash.

Only CPU is AR9341. For CPU's sake, change it.

First contact TTL to take a look at the situation, fortunately, the location of JP8/JP9/JP2 is relatively clear

BootLoader is U-Boot, but it has been solidified and there is no possibility of cutting into it.

Flash for 16m, Winbond W25Q128FVSG Taobao for about 6 yuan (2017.12)

The original memory is ZENTEL's A3S28D40FTPcore 16-bit, change Hynix's HY5DU121622DTP,64M (DDR 400), 1x 2 yuan

The first time you change the chip, you can't do without the tools.

25 chip Flash programmer, first bought XTW100 PRO, not easy to use, and then bought CH341A programmer

Flash clip, it doesn't work, it basically doesn't work.

Wide-body SOP8 programming base

Hot air soldering iron, 100 yuan, not bad

It is easy to disassemble Flash and back up with programmer.

It was troublesome to change the RAM, bought less heat-resistant sucker, and it took more than half an hour to locate the welding foot.

Only change Flash, the system can start, but it can't run because of lack of memory.

For 16m Flash, in fact, as long as the appropriate BootLoader is pre-installed, use the programmer to write the breed of AR9341.

(breed may be a self-developed bootloader based on uboot, and the author decided to close the source. Since there is no commercial use, there is no way to investigate.)

BootLoader is located at the head of Flash and 0x00000000~0x00020000, so just burn it from the beginning.

Breed is easy to use. Upload openwrt firmware with breed.

If you start the system again, you will encounter a startup problem without the support of wireless Wifi.

Because the wireless chip of Atheros uses the so-called ART running tool (detailed in openwrt), ART is the last partition in Flash, with a size of 64K, which is split from the original 2m chip to make an art firmware file. There is an upload art firmware connection in breed, which can be used after upload.

There is a problem with the configuration of OpenWrt. The location of the WAN port is close to the RESET button, which may be applied to the international version.

Firmware download

Breed bootloader for AR9341

Art partition backup

Openwrt official firmware

After reading the above, have you mastered how to change the method of TP-Link WR841N V8 brushing breed and Open? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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