Category Archives: Hardware

Hard reset on Samsung Galaxy J5

For example, perform a full reset of the Samsung Galaxy J5

1) First you need to turn off the phone.

2) Press the volume addition key at the same time, home (oval below) and the power key, keep them all three before the Samsung logo appears, then release.

3) With the volume keys, select “wipe data / factory reset” in the list, and select the power key (possibly also with the Home key), in the next window select “ Yes ” in the same way. And lastly select “ reboot system now ”

Done, the phone will start with completely reset settings and remote user data, such as applications, contacts, etc.

Canon EOS 500D / Rebel T1i Firmware Update

On the test, I will update the firmware 1.1.0 to 1.1.2 in the Canon EOS 500D / Rebel T1i.

First of all, let’s see if there is a newer version on the official siteе and if there is – download it.
https://www.usa.canon.com/internet/portal/us/home/support/details/cameras/support-dslr/eos-rebel-t1i?subtab=downloads-firmware

Unpack the archive with the firmware, in my case I needed one file E7KR6112.FIR

The memory card is pulled out of the camera and connected through the card reader to the computer, we drop the firmware file on it. Through a USB cord directly to a card to write down a file the camera has not given.

We will safely remove the memory card and return it to the camera.

On the camera, set the mode “P” and turn it on, press the “MENU” button, select the yellow key, then “Built-in software ver. … “, agree with the replacement of the current software by selecting” OK “, then follow the prompts on the screen.

Watch the video how I performed the update:

Configuring DHCP relay on Cisco

On the test, I’ll take the Cisco Catalyst 6509-E switch and configure it to forward DHCP packets to the DHCP server.
The switch is configured as L3 with assigned IP addresses in each VLAN.

Connect to the switch through the console or telnet and go to the configuration mode:

enable
configure t

Let’s assume the DHCP server address is 192.168.11.1 and we want to configure the transfer of DHCP broadcast packets to it on VLAN 100, for this we execute the commands:

interface Vlan100
ip helper-address 192.168.11.1
exit

Exit the configuration mode and save the configuration:

exit
write

Done.

Configuring Remote Access in Mikrotik Router

Open “IP” – “Firewall” – the tab “Filter Rules”.
Click “Add new” to add a new rule.

Then set the following parameters:

Chain: input
Src. Address: here you can specify the IP address or network with which it is allowed to connect, if everyone is allowed, then we do not specify.
Protocol: tcp
Dst. Port: 80 (or 8291 for Winbox, 21 for ftp, 22 for ssh, 23 for telnet, udp 161 for snmp)
Action: accept

Click “OK” to add a rule.

After that, in the firewall, a rule will be created at the end of the list. Since it will be the last, and before it there is a rule prohibiting everything, then it must be dragged to the very top with the mouse, otherwise it will not be of use.

Through the command line, the rules will look like this:

/ip firewall filter add chain=input protocol=tcp dst-port=80 disabled=no action=accept

To pick up the list, you can do this (where 30 is the ID of the rule added):

/ip firewall filter print
/ip firewall filter move 30 destination=1

Or in the command itself, we indicate that you need to place the rule at the very beginning of the list:

/ip firewall filter add chain=input protocol=tcp dst-port=80 disabled=no action=accept place-before 0

Also in the menu “IP” – “Services” in the parameters of the desired service, you can add “Available From” the list of IP addresses from which you want to allow access. Access is restricted to both local and external addresses, so first of all you need to add the IP or subnet with which you are currently connected.

I’ll give an example of specifying IP through a terminal for example for telnet (similar to ftp, www, ssh, winbox):

/ip service set telnet address=192.168.1.0/24,172.16.205.50/32,192.168.3.24/32

See also my article:
Configure Hairpin NAT on RouterOS (Mikrotik)

Reset password in Dahua DVRs

First, try the following standard logins and passwords:
1) admin admin или admin 123456 (local and network administrator)
2) 888888 888888 (local administrator)
3) 666666 666666 (restricted user)
4) default default (hidden user)
5) root vizxv (administrator when connecting via telnet)

If the passwords are not suitable, then perform the following steps:
1) Remove the battery from the DVR
2) Connect the screen to the DVR
3) The password is generated based on the current set date in the DVR, when we pulled out the battery, it should be reset by the year 2000 based on this, we use the login admin and password 668648 or 000000 for logging in. Also you can use the following program that can generate a password depending on the specified date .

Download DVR Password

After a successful login, you must immediately change the password.

See also:
Telnet commands for Dahua DVRs

How to get into BIOS on Lenovo laptops

Today it was necessary to go into the BIOS on the Lenovo IdeaPad 110-15IBR laptop (80T7), but when you press all the keys that are usually used to enter the BIOS, the laptop did not respond and the system continued to boot.

As it turned out, in the BIOS of this Lenovo laptop model, the HotKey Mode function is activated as standard and the functional keys are activated instead of the F1-F12 keys.

Therefore, to enter the BIOS, it is necessary to press two Fn and F2 keys simultaneously, if HotKey Mode is disabled, then simply F2.

See also – Function keys Fn on the laptop work the other way around