I cannot visit many website. But after installed ISRG Root X1, it is fine now. But there are some well known website like that i still cannot visit. But i can visit very same website using my friend's data network connected to my phone using hotspot. Im using andorid 6/7.
Hello @Nancy, welcome to the Let's Encrypt community. 
Please see Certificate Compatibility - Let's Encrypt
What is the issuance or usage of a Let’s Encrypt certificate that you are having?
When you opened this thread in the Help section, you should have been provided with a questionnaire. Maybe you didn't get it somehow (which is weird), or you've decided to delete it. In any case, all the answers to this questionnaire are required:
Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is:
I ran this command:
It produced this output:
My web server is (include version):
The operating system my web server runs on is (include version):
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know):
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
Thank you for assisting us in helping YOU!
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It is possible there are other SSL settings on those websites that your very old device cannot handle (like ciphers).
Can you give example of one that fails?
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Try using a proxy.
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