Pluto doesn't work after a firmware update

Question

Hello, 
 
 I have Pluto Rev B device and updated it in DFU mode by running uboot-env.dfu from plutosdr-fw-v0.38.zip 
 update.bat uboot-env.dfu 
 that was my mistake. 
 Then I run: update.bat pluto.dfu 
 which worked well and I got to firmware version 0.38 . 
 Now I need to move back to my old version 0.32 custom build firmware. 
 I tried copying plutosdr-fw-v0.32/pluto.frm to the USB mass storage and tried to do the same in DFU mode by running 
 update.bat plutosdr-fw-v0.38/pluto.dfu 
 and that doesn't work. 
 My questions: 
 Does Pluto support downgrading from form version 0.38 to 0.32? 
 What update.bat uboot-env.dfu does to Pluto? does it change uboot-env in a way that pluto.frm or pluto.dfu can't override? 
 How can I move back to version 0.32 version from version 0.38? 
 
 Thank you

IonutMuthi · Accepted Answer

If you copy all the content from v0.32 archive inside mass storage pluto then eject you it should work. Make sure you don't have files from v0.38 inside mass storage pluto just the ones from v0.32)

Cristian.B. · Answer

Thank you Ionut. That worked. Can you please explain to me what's the difference between pluto.frm and pluto.dfu ? 
 As I understand pluto.frm is the firmware for USB mass storage device update and pluto.dfu is the firmware update image from DFU mode. They both write the same Pluto image. Why are they different files? 
 Thank you

IonutMuthi · Answer

Hello, If you want to go back to V0.32 you can do the steps for update with the files of that release found here 
 Best regards!

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Pluto doesn't work after a firmware update