Linksys WRT 1900 ACS instaliacija DD-WRT ir gryzimas i orginalia firmware 

Installing DD-WRT
1. Visit the DD-WRT FTP to get the latest BS build, pick the year (2015), pick the current build (the latest is 12-01-2015-r28397) and find your current WRT1900AC (Just press Ctrl+F, type in wrt1900ac since there's a lot of routers in the list... it begins with linksys-) and pick the model you have (it currently shows the ac, acs and v2).
2. Download the factory-to-ddwrt.img
3. Login to the router stock firmware at 192.168.1.1 (or whatever address you have it configured as) and click connectivity on the side. There will be a way to upload firmware called "Manual". Choose the img file you downloaded and click start. You will get a few warnings... just say yes and let it upload. The router will reboot eventually and you'll need to navigate back to 192.168.1.1 (The screen will show waiting... but it will be waiting forever until you renavigate).

Congratulations. You just installed DD-WRT. You can now go from there and setup your user/password and configure your router.

I read somewhere to upgrade to a newer build you should return back to the stock firmware and upgrade from there rather than using the DD-WRT interface so you don't overwrite the partition stock is on. Doing so would make it harder to recover the unit in the event of misconfiguration or if a setting bricks the unit.

Booting back to stock from other patition
When you install DD-WRT over stock, it installs on a different partition. You can use the following command by entering it in DDWRT commands on the administration tab, Telnet or SSH to determine what partition DD-WRT is running on.
Code:
ubootenv get boot_part

The last number it returns is the partition (it will return 1 or 2). In my case, DD-WRT is on partition 1, so to return to Stock, enter (If yours returns 2, put 1):
Code:
ubootenv set boot_part 2

and then reboot. You can use the command
Code:
reboot


To reset and boot to stock if you brick DD-WRT installation
1. Assuming the router is on, turn it off.
2. Turn it back on... the power light will illuminate and then go out briefly as it prepares to boot. As soon as it goes out, turn it off again. Repeat this step three times, leaving the router on after the third time you turn it off.
3. Let it boot. It should return to stock after you let it boot.


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