Retevis RT90 is dual band DMR mobile radio.
RT90 supports analog and digital mode, It provides dual band, dual standby, dual display, dual time slot, operating on both 400-480MHz UHF frequencies and 136-174MHz VHF at up to 50 watts VHF and 45 watts UHF. Using Time-Division Multiple-Access (TDMA) digital technology,AMBE++vocoder, compatible with Mototrbo and DMR Tier I &II. The RT90 supports 250 zones, 3000 channel, 10000 contacts, it has built-in CTCSS/DCS, channel scan, priority scan, short text message features, draft message edit, contacts check and edit, and encryption. RT90 has other function, including Private Call, Group Call and All Call, it also includes Lone worker mode, power save mode, low power alarm, an emergency alarm and VOX capability.
We constantly update the RT90 firmware to meet the needs of customers. You can download from Retevis website. https://www.retevis.com/resources-center
After download, we can click the .exe to install the upgrade firmware tool.
We also find there are four firmware editions for use.
RT90 has two hardware version: GPS & Non GPS. If you radio is GPS version, you need to upgrade the GPS firmware. Otherwise, after you upgraded your radio will show white screen, snow screen, or other problems. So if you want to upgrade your RT90 firmware, make sure you choose the right firmware version first. After we know the GPS meaning, now let's learn what's the meaning CSV and REC.
RT90 supports to record function or import 100,000 contacts. but you only choose one, RT90 can't support them at the same time. That's why there are two different editions. If we think the contacts is important for us, we can upgrade the CSV firmware. If we think the record is important, we can upgrade the REC firmware.
How to upgrade the RT90 firmware, here I will show you the detailed steps.
Step 1: Connect the RT90 and computer with RT90 programming cable
The package of the RT90 is not include the programming cable, you need to buy one when you order the RT90.
Step 2: Make sure your RT90 is in the DFU mode.
Step 3: Open the RT90 Firmware upgrade.
Step 4: Click the "Open file upgrade", then selcet the new firmware .bin file.
Step 5: Click the "Download file of upgrade", It will start to upgrade.
Step 6: After it show successful. unconnect the RT90 and computer. Reboot the RT90, we can check the current firmware version.
If you have any other questions, feel free to leave messages to us.