For those who are not interested in reading the background, read the text after the quote

Last night, after a break from all the advice, I tried to change my router back to factory firmware(I once changed it to Beeline myself), I encountered difficulties. First of all, I tried to update stupidly through the menu, indicating the factory firmware version 1.3.3, the update did not happen, that is, the tsatus was that the update was then even written that it was successful, but the standard Beeline menu appears (the router address on the Beeline firmware is 192.168.1.1). then following the advice (of course the router is connected to the computer) I configure it on the computer network connection ip 192.168.0.10 mask 255.255.255.0, turn off the power to the router, press reset, turn on, wait 15 seconds (tried both 20 and 25) trying to constantly log into the router at the address in line 192.168.0.1 (and 192.168.1.1 too) tried both Opera and Google Chrome and IE in general did everything as they said in the article, here I’ll say right away that the router never went into firmware replacement mode, so to speak, “emergency room” here’s a copy-paste of the article but it’s for more early builds there is not much difference in principle

So, here we go:
1. If the router does not show any signs of life, or only the orange “power” diode is on, then first of all we remove all the cords from the router, including the power supply.
2. Download from
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firmware, .bin file from the folder DIR-300NRU/FIRMWARE/B1_B2_B3 strictly for our router and save it, for example, directly to drive C
3. Go to the settings of the network card and in the properties of the TCP/IPv4 protocol set the IP address 192.168.0.10 mask 255.255.255.0
4. Next, we connect the network card of our computer with a wire to one of the LAN ports of the router, let it be LAN1.
(To return the factory firmware DIR-100 you need to connect network card a computer with a WAN port of the router (internet). Specify the location of the previously downloaded firmware and follow the link fla.)
for dir-100
5. In the off state, hold down RESET button(with a match or other blunt object) and holding it, connect the power to the router
6. Without releasing, hold the RESET button (20 seconds), wait until it boots emergency mode router recovery.
7. B Mozilla browser or Opera (not IE) type the address 192.168.0.1 and press the RESET button.
8. We indicate where the firmware is located (where we downloaded it) and click Upload firmware now.
Next, wait until the update is completed
9. If everything is done correctly, then after completion we will see the authorization window for our D-Link/
Login and password will return to default admin/empty
After such simple manipulations, you can restore the factory D-Link firmware after a failure, unsuccessful firmware or after third-party firmware.

I repeat, this article did NOT HELP me.
in the end everything is simply ingenious

You need to select our assembly from the dlink storage office http://ftp.dlink.ru/pub/Router/DIR-300_NRU/Firmware/ in our case “B5” (you can find this out on the sticker at the bottom of the router) ONLY HER if you flash B3 then go the service is guaranteed. In the same place on the storage you can find other useful information such as instructions for different versions Software http://ftp.dlink.ru/pub/Router/DIR-300_NRU/.
LOOKING FOR SOFTWARE with the extension .fwz I chose (DIR_300NRUB5-1.2.94-20110414.fwz)
then by entering the standard Beeline menu of the router at 192.168.1.1, entering the advanced settings, then system, software update, select this downloaded file, click update, it updates longer, but no more than 4 minutes and as a result, the connection is broken or more at the address 192.168.1.1 the router does not appears, go to the address 192.168.0.1 and get into the router menu that was from the store, the default login and password (login admin, password admin) then we update where we want and how we want, I had a need to leave the Beeline firmware due to a change in provider to TTK (I left Goodline, it worked well with the Beeline firmware) I previously connected the Beeline and the factory router from the store was upgraded to Beeline because The IP TV set-top boxes for the TV were behaving inappropriately; after reinstalling everything became stable.