If router is a recent router with at least 4 mb flash chip, then It's possible to install openwrt or dd-wrt for it without any modification to it.
It depend on the router. Now a days most cheaper router that are popular are tp-link routers. But no matter what, You must know the hardware of your router. It doen't matter what anyone says or whatever read over the net. What I mean is even if you got a router that is well known, you still need to open up your router to find out exact SOC chip, flash chip and ram you have. For example, if you have a tp-link 841n/nd router but the model is recent v13 or v13.xx It's most likely a mediatek device i.e. It got a mediatek SOC for sure.
So, if you got mediatek soc you cannot flash the openwrt or dd-wrt for tp link tl-wr841n/nd version 9 or 10 or 11 or 12 firmware for this router. You must install the latest snapshot with clearly mentioning about mediatek soc, If one do not pay attention to this fact, then surely will brick there router and will have a device that do not boot/work. This is the reason one must open up their router and investigate what SOC/FLASH/RAM it got.
Please review the images on your left and right. This is a Tp Link tl-wr841n v-13.1 EU version, EU don't matter much but v-13 are with Mediatek SOC's
If anyone got above router. Then they can use openwrt only, I don't thing dd-wrt supports it fully(as of yet), even then one must be careful as firmware might have beta stuff and may not work espacially the wifi module. Also this router got 8 mb flash and 64mb ram, so It can be upgraded to openwrt or dd-wrt as they got tiny or small version that are less then 4 mb!! Here is Another router of interested for Mediatek SOC,
The Router on the Left is a Tl-Wr840n-V4, This can use the openwrt or dd-wrt made for above Tl-wr841-v13!!. Please see next example too...
Another fact that Most router manufacturer use similar hardware but a bit different board design. Here is one,
As Can be seen in above 840v2 and v3 image they both same as 841v10, In fact V9, 10, 11 and 12 of 841 series of router got almost similar or same SOC( qca9533-al3a or qca9533-bl3a or qca9533 ). I have tested Same version of openwrt on all of them(Mentioned above), they work...But Have a very small difference in V12 to others mentioned.
Tp link 840 and 841 are same/similar on some versions at least. Looks Tp link used the same soc on almost all routers produced in a specific time frame!! This can be found in other routers made by Asus, Cisco, tenda etc.
So If anyone got a tp link Tl-wr840-v3 or 840v2 they can use the openwrt firmware for tp-link 841v-10, Same for the u-boot, U-boot for 841v10 can be used for 840v2 or 840v3, I have tested it and running openwrt and u-boot for 841v10 in 840v2 and 840v3.
Also as these routers got 4 mb flash chip they can be flashed with small/tiny version of dd-wrt or openwrt(openwrt got only tiny version for these routers). But To use openvpn or use it as a vpn server or wish to use QOS, then need more ram, at least 64mb is required, soc processing power is adequate at 550/650 Mhz. But also should be noted that to use 840 series of router for 10/15 users for 24/7 will not be possible, if tried they may fail. But with further mods like a heatsink and a fan, still possible!!! But again a lot more mod required, Also helps if u replace the cheap Electrolytic Capacitors with better once and It will surely work, I have done it, it's doeable.
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My Profession : By trade I'm a Software Engineer. But I Love trading currency or Forex markets and trade mostly eurusd markets. So I needed a reliable and dependable router system that I think openwrt or tomato can provide with a good ISP. I trade with reputable International Forex brokers.
To know how to do Forex Trading go here : Forex Trading: My regular source of income
For signals on eurusd go here My Forex Trading Journal
It depend on the router. Now a days most cheaper router that are popular are tp-link routers. But no matter what, You must know the hardware of your router. It doen't matter what anyone says or whatever read over the net. What I mean is even if you got a router that is well known, you still need to open up your router to find out exact SOC chip, flash chip and ram you have. For example, if you have a tp-link 841n/nd router but the model is recent v13 or v13.xx It's most likely a mediatek device i.e. It got a mediatek SOC for sure.
So, if you got mediatek soc you cannot flash the openwrt or dd-wrt for tp link tl-wr841n/nd version 9 or 10 or 11 or 12 firmware for this router. You must install the latest snapshot with clearly mentioning about mediatek soc, If one do not pay attention to this fact, then surely will brick there router and will have a device that do not boot/work. This is the reason one must open up their router and investigate what SOC/FLASH/RAM it got.
Please review the images on your left and right. This is a Tp Link tl-wr841n v-13.1 EU version, EU don't matter much but v-13 are with Mediatek SOC's
If anyone got above router. Then they can use openwrt only, I don't thing dd-wrt supports it fully(as of yet), even then one must be careful as firmware might have beta stuff and may not work espacially the wifi module. Also this router got 8 mb flash and 64mb ram, so It can be upgraded to openwrt or dd-wrt as they got tiny or small version that are less then 4 mb!! Here is Another router of interested for Mediatek SOC,
Tp Link TL-Wr840n(RU)-V4
The Router on the Left is a Tl-Wr840n-V4, This can use the openwrt or dd-wrt made for above Tl-wr841-v13!!. Please see next example too...
Another fact that Most router manufacturer use similar hardware but a bit different board design. Here is one,
TP-LINK TL-WR841-V10
TP-LINK TL-840-V2.0/V3.x
Tp link 840 and 841 are same/similar on some versions at least. Looks Tp link used the same soc on almost all routers produced in a specific time frame!! This can be found in other routers made by Asus, Cisco, tenda etc.
So If anyone got a tp link Tl-wr840-v3 or 840v2 they can use the openwrt firmware for tp-link 841v-10, Same for the u-boot, U-boot for 841v10 can be used for 840v2 or 840v3, I have tested it and running openwrt and u-boot for 841v10 in 840v2 and 840v3.
Also as these routers got 4 mb flash chip they can be flashed with small/tiny version of dd-wrt or openwrt(openwrt got only tiny version for these routers). But To use openvpn or use it as a vpn server or wish to use QOS, then need more ram, at least 64mb is required, soc processing power is adequate at 550/650 Mhz. But also should be noted that to use 840 series of router for 10/15 users for 24/7 will not be possible, if tried they may fail. But with further mods like a heatsink and a fan, still possible!!! But again a lot more mod required, Also helps if u replace the cheap Electrolytic Capacitors with better once and It will surely work, I have done it, it's doeable.
=====================================================================
My Profession : By trade I'm a Software Engineer. But I Love trading currency or Forex markets and trade mostly eurusd markets. So I needed a reliable and dependable router system that I think openwrt or tomato can provide with a good ISP. I trade with reputable International Forex brokers.
To know how to do Forex Trading go here : Forex Trading: My regular source of income
For signals on eurusd go here My Forex Trading Journal
Bro can u share the backside wireless password?
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