Because .rar files can execute scripts or contain malware, you should only open this file if you downloaded it from a trusted official source. If you found this file on your computer unexpectedly: immediately.
The most prominent source for this file is the DEXP EV-700 product page on E-Katalog . On these technical support sites, "21354.rar" typically contains the firmware files or the digital user manual for the DEXP EV-700 dashcam. 21354.rar
Could you clarify or if you are looking for a specific firmware update ? DEXP EV-700 - E-Katalog Because