Error on Android Factory Reset with Recovery Image Signed

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Error on Android Factory Reset with Recovery Image Signed

Contributor I


in my project I use an i.MX6S and I have used code signing tool version 2.3.1 to sign u-boot.imx and boot.img of my Android 5.1 distribution.

Everything works fine and with my board fuse-locked I'm able to update only signed images.

Now I need to add signature also to Android Recovery image. I realized it similarly to boot.img signature and on board startup with correct keys combination I'm able to enter into a signed Recovery.

The problem is that if I made from Android UI a Factory Reset on reboot Recovery doesn't start and from this point also on startup doesn't start and I need to download again Recovery image with mfgtool to fix the problem.

It seems that factory reset corrupts in some way I don't understand the recovery partition.....any idea?


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NXP TechSupport
NXP TechSupport


  When signed image is loaded and run by boot ROM or with help of signed U-boot

all is working. Android (UI) does not support HAB.

Have a great day,

Note: If this post answers your question, please click the Correct Answer button. Thank you!

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Contributor I


thanks for the reply but maybe I didn't expose correctly the problem.

I know that Android UI does not support HAB but the problem is that

Android UI modifies somthing into recovery.img before a factory reset

corrupting the signature (that I made with CST on recovery.img) and from

that point I'm unable to start Recovery Mode untill I download again

recovery.img from MFGTool

Many thanks


Matteo Bissoli

Firmware Designer

Leonardo – Finmeccanica – Società per azioni

Via delle Officine Galileo, 1

50013 – Campi Bisenzio (Fi) - Italia

Tel: +39 055 536(9)245


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