They are a rebranded Atten, made by Siglent.
5 or 7" display ?
Does it have a LAN port, if so it's the DL+ model and LAN and higher res display were the upgrades from DL models.
Ch 2 trace color was also changed from blue to cyan.
Be treble sure before you use any Siglent FW that the FW versions have similar #'s and format to what is displayed in the System page.