The Chinese-owned African mobile phone giant Tecno is rebutting new accusations that its W2 phones came pre-installed with malware. In a statement sent to the Nigerian tech news website Silicon Nigeria on Tuesday, Tecno claimed that the Triada malware was first discovered in April 2018 and since then the company distributed a patch that customers could use to remove the program.

The company added that if customers ran any system updates on their phones since 2018, then that would have eliminated the problem. For those who haven’t yet done so the company advised: “For current W2 users facing Triada issue presently, we advise that they download the [over the air] fix on their phone for installation, or contact TECNO’s after-sales service support for assistance.”