Don't worry, everything is fixable) there are several ways to recover data at once
If not quite clearly explained, then go read the article, it is here
How you can find out the password for your Wi Fi network , see here - https://lanportal.ru/wifi/kak-uznat-parol-ot-wifi.html
Here's a step-by-step instruction with video how you can change the (forgotten) password on a WiFi router - https://lanportal.ru/wifi/kak-pomenyat-parol-na-wi-fi.html
You can change it
Step 1 Connect to the desired network
In the Wi-Fi settings on your device (laptop, smartphone, tablet, etc.) choose the network you need. Usually her name coincides with the name of the router manufacturer. Connect to the desired Wi-Fi network.
STEP 2 192.168.1.1 or 192.168.0.1
Open a browser on your device ... In the browser line, enter the ip-address: 192.168.1.1 or (if the first did not give a result) 192.168.0.1 You should go to the router settings.
STEP 3 Login to the router
You have entered the settings of the router. By default, on routers, the login is admin, the password is admin or 1234. Or the login and password for access are usually pasted on the bottom of the device. Further, the interface may differ for each manufacturer. In the next steps, select the router you need.
Attention! If the proposed login and passwords did not fit, then take the router in your hands, find a small button on it (the size of a needle diameter) about it is usually written RESET. Press this button and hold for 30 seconds (approximately). This is how you reset the router settings to their original settings.
STEP 4 D-Link
On the left, select the Network - WAN item. Find PPP. Next, in the "Password" and "Password confirmation" fields, enter the password you need.
STEP 5 ASUS
Select the item (left) "Wireless" (or "Wireless", or "WAN ", or" Internet "). Select the "General" tab (or "Internet Connection") In the "Pre-Shared WPA Key" item, enter the password for your Wi-Fi. Click "Apply" (or "Apply").
STEP 6 TP-Link
Select "Wireless Security ".
Check the" WPA / WPA2 - Personal (Recommended) "box.
In the" PSK Password "box, enter the password you want.
STEP 7 ZyXEL
Select the icon with the network image below (usually located exactly in the middle).
In the " Network key "enter the password you need.
Click the" Apply "button.
STEP 8 Zyxel Keenetic
In the Wi-Fi Security Setup window, find the Network Key (ASCII) field and enter the password you want.
STEP 9 MTS
Go to the "Settings" tab.
On the left selectRetrieve WLAN and Basic Settings.
In the WPA Key field, enter a new password.
1 if you entered it on a laptop with Windows, then you can see it in the wireless network control center
2 if your router is old and it has a wds function, then you can view it from an android device via wi-fi warden or wps tester (the phone must be with root rights)
3 go into it via a lan cable connect to port 1, 2, 3 or 4 and enter the default login and password - admin admin (if you have a flashed router based on openwrt then root root) in the security tab there will be a password
Very necessary !!!