RSMART-1510 Not working with Qx but works with Blazer_USB with Lang_Fix added

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Nut scanner suggests:

sudo nut-scanner                                                                                                                                                                           ✔  15s  
Scanning USB bus.
No IP range(s) requested, skipping SNMP
Scanning XML/HTTP bus.
No IP range(s) requested, skipping NUT bus (old libupsclient connect method)
Scanning NUT simulation devices.
[nutdev-usb1]
        driver = "nutdrv_qx"    # alternately: blazer_usb nutdrv_atcl_usb
        port = "auto"
        vendorid = "0001"
        productid = "0000"
        # bus = "005"
        # device = "005"
        # busport = "002"

But the config that works is (lang_fix is required:

driver = "blazer_usb"
port = auto
langid_fix="0x409"
vendorid = "0001"
productid = "0000"

Driver output

upsdrvctl start
Network UPS Tools upsdrvctl - UPS driver controller 2.8.3 release
Network UPS Tools 2.8.3 release - Megatec/Q1 protocol USB driver 0.21
Please note that this driver is deprecated and will not receive
new development. If it works for managing your devices - fine,
but if you are running it to try setting up a new device, please
consider the newer nutdrv_qx instead, which should handle all 'Qx'
protocol variants for NUT. (Please also report if your device works
with this driver, but nutdrv_qx would not actually support it with
any subdriver!)

Supported UPS detected with megatec protocol
Vendor information unavailable