[https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x131e_chrome_hmm_en_0c10473_02.pdf|Find the write protect switch inside the case on page 14 of this pdf file. Requires some disassembly of course. Good luck]
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[https://mrchromebox.tech/#home|Easiest route to getting linux installed after you unprotect the chromebook]
[https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x131e_chrome_hmm_en_0c10473_02.pdf|Find the write protect switch inside the case on page 14 of this pdf file. Requires some disassembly of course. Good luck]