TP-LINK TL-WR841nd v8/v7 30dBm hack - OpenWrt 18.06.1

[lleachii]

@attaros

That went well with all posts around and then i read that we can ArtHack the eeprom to increase
txpower power.

@attaros

This is not what i asked though (regulations depend on country, not everybody is in US or EU).

Your question violates the Community Guidelines. Modifying the radio post-manufacture is illegal in most countries, not just the US and in the EU; and for multiple reasons other than just power. For more information, see:

RADIO REGULATIONS - International Telecommunications Union - 2016 Edition - VOLUME I
CHAPTER I - Terminology and technical characteristics
ARTICLE 3 - Technical characteristics of stations

Radio Regulations

Also see: Reghack works in the latest stables versions of LEDE? - #8 by lleachii

and: Linksys WRT1900AC v2 Reghack - #3 by lleachii

@attaros

I have a backup of the eeprom and restoring it then brings the wrt841 to work again.

You will have to, I understand this doesn't work in newer Kernels, anyway. So, you'll be running an outdated firmware with an illegal transmitter. I advise against that.