Disabling the external HDMi display during boot time was NOT my idea; yet it may have been this way before i noticed, from the begining. Anyway it sort of worries me still not having a BiOS recovery flash drive, being too lazy (after getting drained...), just assuming Dell's safeguards can catch up the day i need it...
It sure does, so far. Dell ruined a 1st impression nonetheless! What's troubling me most i guess was to find ZERO mentions of the string "B92LTW3" which i NOW know to be a « Sevice Tag S/N », since i found it in print on this NetBook's back... Checking my notes it seems many "Part Numbers" kept flying all over the place, hence the perpetual confusion - an unsolvable clue finally cleared with help from the machine itslef, via HardInfo: it's a Dell SKU #0B92.
The day before my purchase i downloaded document 'inspiron-3520-ss-fr.pdf' in some futile attempt to deceipher their configuration matrix, in vain as it obviously didn't allow ne to predict the outcome correctly. Of course there's lawyer fine-prints in it, paving the way to such model substitutions, so actually the term « unseen » sounds quite like an understatement here!!
I mean if one feels a need to hire a lawyer mandated to hire a NASA engineer, etc., m'well that maybe the hint it's going to prove wrong to overlook. They win, i loose: lesson learned, just too late as there can be only 1 first time.
Naturally it depends on the individual, my own fault was to be quick to gamble with a loaded dice. Other opportunities equally qualifiable as an « End-of-Life » product line offered me SATA3 like transfer performance too while i assumed M.2 juxtaposed with NVMe/PCIe was good news (...), especially putting a convenient amovible format in the balance that my selection option doesn't offer. Etc., etc.
Perhaps it's possible to get a great Linux experience, somewhere somehow. YMMV!
I wish the best of luck to all players...