Chromebox 3 enterprise locked

i have chromebox 3 and it says developer mode is locked from manager. Is it over for this box? can I get it working from flashing or anything?
thanks

treat box as bricked, flash using ch341a USB programmer per unbricking instructions on https://mrchromebox.tech. Use the FIZZ firmware image for your device.

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can you suggest which programmer i need to get? i see many kinds from 5 to 15 usd. i would like to use the simplest programmer. also would this work on dell chromebook 11 3180? i have it, with the same issue.
thanks for the reply

get one with a ch341a, a chip clip, and a 1.8v step-down adapter. Should run you $15 or less, and will work on both devices