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QUALIFIED TRUST SERVICES

Legally compliant digital signatures (eIDAS) to drive forward the digitalization of your business processes.

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CORPORATE TRUST SERVICES

Cryptography-based trust services
to protect your digital identities,
data and business secrets.

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Qualified electronic signature products based on eIDAS - legally binding and secure.

INDIVIDUAL
ENTERPRISE
OEM
PRODUCTS

Easy-to-use, legally secure and flexible. Simple as that.

ONLINE SHOP
API GUIDE

Upgrade your application with electronic signatures by primesign.





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DOCUMENT SIGNING API

Signing of PDF documents. primesign handles document processing and adds a visual signature stamp.

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HASH SIGNING API

Signing of hash values. Your application handles document processing and provides the document viewer.

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CASH BOX API

RKSV-compliant JWS- or raw signatures for cash box receipts.





DOCUMENTATION
primesign TRUST CENTER

All documents for our qualified trust services, certificate revocation list, root-/CA- certificates, etc.

TRUST CENTER
RESOURCES

Fact sheets, product documentation and more.



RESOURCES

A55 Firmware Exclusive Download — Zte Blade

Downloading and installing the official ZTE Blade A55 firmware

For the safest experience, users should prioritize official sources before attempting to use third-party "flash files." zte blade a55 firmware download

Below is a structured article you can use for a blog, support page, or forum post. Downloading and installing the official ZTE Blade A55

⚠️ I cannot provide direct download links because firmware files change frequently and may contain malware. However, here’s how to find them safely: here’s how to find them safely: