This is not possible without bootloader modification.
TP-link build a tiny u-boot to fit in one flash block(64kb). Only this commands are compiled in:
For a fully featured u-boot it is necessary to change the flash layout.
It should be possible to add only bootm cmd if you are willing to flash a modified bootloader.
Here are the bootloader files:
Source:
unmodified:
https://github.com/timowi/wr841nv14boot/releases/download/original/uboot-unmodified.bin
64MB Ram version:
https://github.com/timowi/wr841nv14boot/releases/download/mod64M/uboot-mod64M.bin
WARNING: Only flash this image after soldering 64MB ram
support added in my LEDE fork https://github.com/maurerr/openwrt for TL-WR841N v14 see [Testing] lede-17.01 security backports for 4/32 devices
Hello.
I want to try to replace the flash chip with 8MB. What do you need in the firmware?
Thanks.
I upgraded my router to 8M flash memory. RAM left 32M, I did not change this chip. Attached a patch for the current snapshoot. I used unmodified u-boot from Timowi (see up)
$ ssh root@OpenWrt /var/opt/vanessa/router/tp-wr841-v14/timowi/openwrt
root@openwrt's password:
BusyBox v1.31.1 () built-in shell (ash)
_______ ________ __
| |.-----.-----.-----.| | | |.----.| |_
| - || _ | -__| || | | || _|| _|
|_______|| __|_____|__|__||________||__| |____|
|__| W I R E L E S S F R E E D O M
-----------------------------------------------------
OpenWrt SNAPSHOT, r15004-4799810745
-----------------------------------------------------
root@OpenWrt:~# cat /proc/cpuinfo
system type : MediaTek MT7628AN ver:1 eco:2
machine : TP-Link TL-WR841N v14 8M
processor : 0
cpu model : MIPS 24KEc V5.5
BogoMIPS : 385.02
wait instruction : yes
microsecond timers : yes
tlb_entries : 32
extra interrupt vector : yes
hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa : mips1 mips2 mips32r1 mips32r2
ASEs implemented : mips16 dsp
Options implemented : tlb 4kex 4k_cache prefetch mcheck ejtag llsc pindexed_dcache userlocal vint perf_cntr_intr_bit perf
shadow register sets : 1
kscratch registers : 0
package : 0
core : 0
VCED exceptions : not available
VCEI exceptions : not available
root@OpenWrt:~# df -hT
Filesystem Type Size Used Available Use% Mounted on
/dev/root squashfs 3.5M 3.5M 0 100% /rom
tmpfs tmpfs 12.9M 304.0K 12.6M 2% /tmp
/dev/mtdblock4 jffs2 2.6M 232.0K 2.4M 9% /overlay
overlayfs:/overlay overlay 2.6M 232.0K 2.4M 9% /
tmpfs tmpfs 512.0K 0 512.0K 0% /dev
root@OpenWrt:~# uname -a
Linux OpenWrt 5.4.77 #0 Mon Nov 23 11:52:11 2020 mips GNU/Linux
root@OpenWrt:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00010000 00010000 "boot"
mtd1: 007e0000 00010000 "firmware"
mtd2: 001daf47 00010000 "kernel"
mtd3: 006050b8 00010000 "rootfs"
mtd4: 002a0000 00010000 "rootfs_data"
mtd5: 00010000 00010000 "factory"PS The question is not on the topic: what is the factory partition ?
this upgrade has a problem: the router reboots periodically, about once a day.
Hello maurer,
I've been using your firmware for my v14 but the config isn't kept after a reboot. I've tried several compilations from the source but can't find the right modules to activate. Can you share your parameters for the dnscrypt build?
Unfortunately I don't own a v14 anymore.
To compile stripped down builds just follow https://openwrt.org/docs/guide-user/additional-software/saving_space
Can I use the first one in my tlwr841 v14?
sure, go ahead
Hello,
I have seen this thread to support the above router on OpenWrt. I have created my own image (based on official 18.06.9) which includes:
CONFIG_TARGET_ramips=y
CONFIG_TARGET_ramips_mt76x8=y
CONFIG_TARGET_ramips_mt76x8_DEVICE_tplink_tl-wr841n-v14=y
CONFIG_BUSYBOX_CUSTOM=y
CONFIG_BUSYBOX_CONFIG_ASH_OPTIMIZE_FOR_SIZE=y
# CONFIG_BUSYBOX_CONFIG_FEATURE_IPV6 is not set
# CONFIG_IPV6 is not set
# CONFIG_KERNEL_CRASHLOG is not set
# CONFIG_KERNEL_ELF_CORE is not set
# CONFIG_KERNEL_IPV6 is not set
# CONFIG_KERNEL_PRINTK is not set
CONFIG_LUCI_SRCDIET=y
CONFIG_PACKAGE_cgi-io=y
# CONFIG_PACKAGE_dropbear is not set
CONFIG_PACKAGE_libiwinfo-lua=y
CONFIG_PACKAGE_liblua=y
CONFIG_PACKAGE_liblucihttp=y
CONFIG_PACKAGE_liblucihttp-lua=y
CONFIG_PACKAGE_librt=y
CONFIG_PACKAGE_libubus-lua=y
CONFIG_PACKAGE_libupnp=y
CONFIG_PACKAGE_libuuid=y
CONFIG_PACKAGE_lua=y
CONFIG_PACKAGE_luci=y
CONFIG_PACKAGE_luci-app-firewall=y
CONFIG_PACKAGE_luci-app-upnp=y
CONFIG_PACKAGE_luci-base=y
CONFIG_PACKAGE_luci-lib-ip=y
CONFIG_PACKAGE_luci-lib-jsonc=y
CONFIG_PACKAGE_luci-lib-nixio=y
CONFIG_PACKAGE_luci-mod-admin-full=y
CONFIG_PACKAGE_luci-proto-ppp=y
CONFIG_PACKAGE_luci-theme-bootstrap=y
CONFIG_PACKAGE_miniupnpd=y
CONFIG_PACKAGE_rpcd=y
CONFIG_PACKAGE_rpcd-mod-file=y
CONFIG_PACKAGE_rpcd-mod-iwinfo=y
CONFIG_PACKAGE_rpcd-mod-rrdns=y
CONFIG_PACKAGE_u2pnpd=y
CONFIG_PACKAGE_uhttpd=y
CONFIG_STRIP_KERNEL_EXPORTS=y
CONFIG_USE_MKLIBS=y
CONFIG_PACKAGE_kmod-nf-ipt6=y
CONFIG_PACKAGE_libip6tc=y
You can get .bin files here:
Screenshot:
Feedback apreciated.
Hello , I had tried your firmware it works but I can't SSH my device
is there a trick for that.
thank you
I thing that is disable, testing now
ssh and tftp services are not functional or disabled
it is no longer possible to update or modify the device
no suggestions please
i don't know how to restore or change firmware without ssh or TFTP
Hi, I am using this, thanks a lot, I am totally new and noob here, can you please give guide for this where I can replace UPnP with openvpn somehow?
Can I get openvpn in this? also .trx?
In case if anyone is still interested in upgrading their old V14, I've done some modifications here and it can be permanent in some ways. so enjoy modding!
I have installed the official snapshot through TFTP and tested @ulbricht-inr sysupgrade with LuCI but it's not persisting the changes 
Not sure if there is a working firmware that persist changes for 14.0 4/32 currently
EDIT:
Here are my builds based on @Shine- 19.07 patch and configs (using latest 19.07 snapshot from github r11431-83b0e20711)
Working great. So far the only ones that have worked for me with persistent memory for v14.0 with a fairly recent openwrt version compared to all those based on 17/18 I've seen on this thread.
Hi, I have an TL-WR841N v14 00000014 with 0.9.1 4.17 v0283.0 Build 200921 Rel.74350n
I have no idea if it has 4/16 or 4/32 as the fw doesn't show it, how can I know?
I want to use it as Access point only, eventually I would like it pay support PPPoE if in this package it is supported L2TP protocol (please tell me thanks). No IPv6. The problem I have is that with latest stock the device start blocking comunication between devices connected on WiFi (but not the ones on etherent), a reboot solves it but for some minutes only, thes is why I want to upgrade
I've read some contraddictions in this topic so I would like to clear them before proceed.
Which image you recomend to flash?
Can I flash it choosing the upgrade inside the web interface of the stock fw? Or do I need tftp?
Does it include the new bootloader? Should I update the bootloader too? (I would not do it)
Can I eventaully reverst to stock by web interface? Or should I TFTP?
In this topic I've found there, d you recomend/tested? Thanks
Support for TL-WR841N v14 - #37 by maurer somebody syas it can't save config. Also not clear if this version workd for upgraded 16/64 version only
Support for TL-WR841N v14 - #53 by mpestotnik from snapshots this guy looks to have an a router with 32 flash, how can I know if it fits on mine? also tftp and ssh are disabled, can fw be changed by the web interface after?
Thanks for support
