# AT+KCERTSTORE on HL8518 Modem fails

**URL:** <https://forum.sierrawireless.com/t/at-kcertstore-on-hl8518-modem-fails/14114>\
**Category:** Legacy HL Series\
**Created:** [October 10, 2018, 3:03pm UTC](https://forum.sierrawireless.com/t/at-kcertstore-on-hl8518-modem-fails/14114 "2018-10-10T15:03:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jalleth](https://avatars.discourse-cdn.com/v4/letter/j/e9c0ed/32.png) [@jalleth](https://forum.sierrawireless.com/u/jalleth)\
**Post date:** [October 10, 2018, 3:03pm UTC](https://forum.sierrawireless.com/t/at-kcertstore-on-hl8518-modem-fails/14114/1 "2018-10-10T15:03:00Z")

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Hi,  
I’m currently trying to store a certificate ( .crt) on my HL8518 modem. I 'm working with Minicom on Ubuntu. My filesize is 1462 bytes.

I type :  
"  
AT+KCERTSTORE=0,1462  
CONNECT"  
At this point, I decide to send my file (ctrl+a then s with minicom). The first problem is that I don’t know what protocol to choose between x/y/zmodem, kermit and ascii:

- x/y/zmodem does not work at all (wait for a NACK from the modem which never arrive)
- kermit does not seem to work (no message)
- ascii send me this message  
 ![Screenshot%20at%202018-10-10%2017%3A09%3A54](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/6/6b09b2c6809e9a43f8d81392377c3b806d146858.png)  
The last message means “READY: press a key to continue…”  
However when I press a key I’ve got an “ERROR” message. And my certificate is not stored.

Does anyone knows what is happening here ?

Thanks !

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**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\
**Post date:** [October 15, 2018, 1:44am UTC](https://forum.sierrawireless.com/t/at-kcertstore-on-hl8518-modem-fails/14114/2 "2018-10-15T01:44:21Z")

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Hi jalleth,  
Please select “Send files”-\>ascii.