[Need help] Dell Chromebook 3380: Shell Mode not working - Chromebooks

Hi there
I have a dell Chromebook 3380 (ASUKA D2S-A3C-J4N-W6W-G3K-A72). After successful installation of GalliumOS in chromebook. Its not booting into the GalliumOS nor going into shell mode as CTRL+ALT+F2 keys are not working. CTRL+L or CTRL+U not working either after getting developer options and turning off the OS verification. Nor Powerwash/Reset working.
Chrome OS Recovery not working either I have tried several USB sticks and tried different types of recoveries.
Chrome OS recovery not working getting error "The device you inserted does not contain Chrome OS".
Please help me to fix this issue.
Please help I am stuck here.

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