ISRG Root X1 not supported on ios 9.3.5

Thank you so much! This resolved my issue!

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Thanks so much to everyone for all of the help on this issue. I have downloaded the certs manually and can now use Overdrive (and presumably Libby, their other app).

I have also forwarded them the info on their web server that was posted here!

Sorry for the delay in responding. Just got back from a vacation.

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