Problems with opkg update : Remove wrong Signature file

HI from Argentine! I'm new here
I have Dragino YUN SHIELD v 2.04 and I have serious problems with update from some days ago.
I need to install ssl packages and I start with the opkg update problems. So I reflash YUN.. but now is worst. I canno install ANY PACKAGE.
Can somebody help me to installa packages manually or bypass all protections? Is very frustrating
THANKS a lot!!!!

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