If your device is stuck in a boot loop:
| Source | URL / Access Method | Reliability |
|--------|---------------------|--------------|
| HVT Official Support Portal | https://support.hvt.com/portal (Login required) | ★★★★★ |
| Authorized Distributor Dashboard | Ask your regional HVT partner | ★★★★★ |
| Device’s Built-in Check | System → Firmware Upgrade → Check Online (If enabled) | ★★★★☆ |
| HVT FTP Server | ftp://ftp.hvt.com/pub/jmr1040/ (Read-only, legacy) | ★★★☆☆ |
In case R3.53 introduces instability in your specific deployment (e.g., with ancient Modbus slaves), rollback is possible: hvt-jmr1040-r3.53 firmware download
HVT officially supports rollbacks only between R3.5x releases. Downgrading from R3.53 to R2.x requires a full NAND reformat via JTAG – not recommended.
Unlike consumer devices (smartphones, routers), industrial controllers like the HVT-JMR1040 have tight hardware-firmware coupling. Using a mismatched version can lead to: If your device is stuck in a boot loop:
HVT explicitly states in their technical bulletin TBN-HMI-2022-09 that units with PCB revision 3.2 or higher must use only firmware R3.52 through R3.55. R3.53 is the most stable release for hardware batch numbers JMR1040-HW-3.2B and JMR1040-HW-3.2C.
How to check your current firmware version: | Source | URL / Access Method |
Contact the distributor from whom the unit was purchased. Provide:
Examples of HVT distributors with documented JMR1040 support:
(Note: These are example values. Get the real ones from HVT’s official site.)
A: Yes, it updates U-Boot from 2023.04 to 2024.10. This improves NAND wear leveling but adds 30 seconds to first boot. Do not interrupt.