You can download the free Wyse USB Firmware Tool here. You will also need to download the firmware image you want to re-load back onto the thin client. You can access the images you need directly from the Dell support site here.You will also need a USB drive to copy the image onto which you will then put into the device you want to re-image.
wyse usb firmware tool 1.20 download
Old Firmware tools 1.20 and 1.21 don't seem to run on Win10; and so I ended up using old XP box to create the USB image. The exact file name for the Firmware tool is: Wyse_USB_Firmware_Tool_v1.21.0.2.exe . Also tried the newer Dell_Wyse_USB_Imaging_Tool_v2.1.3 with win10, but that didn't work for me either. Otherwise, you guys might contact the Dell forum administrators and have them mail you proper links.
Next, you have to download the proper Merlin Image for your device not the raw image, in our case a Dell Wyse 3040: -de/product-support/product/wyse-3040-thin-client/driversOS_Merlin_v8.6_B013_3040_ENG.zip
I have a Dell XPS 9370 that dual-boots between Linux and Windows. It currently runs firmware version 1.19.0; the Dell Update application on Windows downloads and attempts to install version 1.20.0 -- however, the system always boots back into version 1.19.0 after this attempt.
I've tried downloading the .rcv file ("recovery") for firmware 1.20.0 to a partition the UEFI firmware can access, and pointed the firmware update tool available from the boot menu at both the .rcv and .exe versions of the BIOS Update image; this tool recognizes both files as BIOS updates, but when attempting to apply either one the system immediately reboots and then is back in firmware 1.19.0. 2ff7e9595c
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