My issue is that the Overdrive and Libby apps by overdrive.com use the Let's Encrypt certificate and now neither app works on my older iPad (ios 9.3.5). I get a "the certificate for this server is invalid." error that refers to link.overdrive.com . ISRG Root X1 isn't on the list of trusted certific…

ISRG Root X1 not supported on ios 9.3.5

MikeMcQ October 5, 2021, 6:05pm 2

@KarenZ Welcome to the community.

I don't have any specific suggestions but this thread has more details and possibly a solution. I have linked to the middle of the thread but earlier posts there might be helpful too.

Topic		Replies	Views
I have just found this: - https://mjtsai.com/blog/2021/09/24/some-web-sites-will-stop-working-with-el-capitan-and-older/ The Let’s Encrypt Root Certificate, the IdentTrust DST Root CA X3 certificate, has expired Help	5	462	May 13, 2022
Support for IOS? Help	2	3903	June 25, 2017
ISRG Root X1 untrusted since yesterday Help	3	111	August 23, 2024
Getting the intermediate chain after the September 2021 changes? Help	5	1033	December 26, 2022
KeyStore / ISRG Root X1 Help	7	1641	October 8, 2021

ISRG Root X1 not supported on ios 9.3.5

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