Hmmm... that's the right one. The credentials are changed through the modified OS update file, rather than the App firmware update.
https://www.eevblog.com/forum/testgear/siglent-ads-firmware-file-format/msg1606243/#msg1606243
As rf-loop described in A. Load the standard SDS1004X-E Firmware (4-Channel Model) - 6.1.25R2 (Release Date 06.29.18 ) file, then the modified SDS1004X-E Operating System-V1 (Only For 4-Channel ) (Release Date 06.26.18 ) from the post listed.
Alright here's what my process was before failing to get login credentials correct:
The first thing I did was format my 32 gigabyte USB flash drive to FAT32. Then I added the FW 7.1.6.1.25R2.ads file to the usb drive, dismounted it, and plugged it into the scope. I turned the scope on, and then followed the instructions to install the firmware and self calibrated the scope. I verified that I was running the 25R2 firmware at software level 0 (no software update performed yet).
Then, according to RF-Loop's instructions:
Update latest FW and OS (if not already out from box).
SDS1004X-E Firmware (4-Channel Model) - 6.1.25R2 (Release Date 06.29.18 )
SDS1004X-E Operating System-V1 (Only For 4-Channel ) (Release Date 06.26.18 )
These both can download from Siglent official side. Inside these both packages (zip) there is also instructions.
I downloaded the latest software update from the siglent website and put the 4 software files on a newly FAT32 reformatted USB drive. I turned off the scope and plugged the USB drive in. I then booted the scope, and it installed the software, and verified that I was now running at software level 1. Then I turned the scope off, took out the USB, reflashed it with the 4 custom files with the modified root login, plugged this back into the scope, started it up and let it return to the main screen.
I then tried to telnet into the scope on port 23, I got to the login page and entered the username root and the modified password and received a "login incorrect" message. I tried many different combinations of login name and password, as well as the correct password numerous times. I rebooted the scope, tried reinstalling the modified software, tried reinstalling the 25R2 firmware, all to no added effect. I noticed that the boot time to main screen remained the same regardless of what software file I put on the USB, and regardless of whether or not there was even a USB inserted (20 seconds regardless). These times were measured after the initial official software boot.
I can try instaling the 25R1 firmware and retrying this whole process, but I cannot seem to find a good download location for it. Also I have tried to hardware reset the scope using the instructions on the
Siglent website, but that process has not worked each time I have attempted it.
Its possible that they have invalidated this method of changing the root user login when you install the official software update first.
Any suggestions are most welcome.