Smart-ServiceBerde i have the same problem...
Firmware package: sweet_global_images_V12.0.12.0.RKFMIXM_20210407.0000.00_11.0_global
Scanning for Qualcomm HS-USB QDLoader 9008 device...
Download Port: Qualcomm HS-USB QDLoader 9008 (COM3)
Connection status: EHCI:HUB:HUB:HUB[#4]:USB 2.10 High-Speed
USB Device: [Qualcomm CDMA Technologies MSM] QUSB_BULK_CID:040F_SN:02AA103A
USB Driver: [Qualcomm Incorporated] qcusbser:qcusbser.sys, version: 2.1.2.7, date: 8-2-2017
Initializing...
MSM Serial number: 0x02aa103a
MSM HW ID: 0x000e60e1 (SM7150), OEM ID: 0x0072 (Xiaomi), MODEL ID: 0x0000
OEM Public Key Hash: 1bebe3863a6781db4b01086063007334de9e5ca14971c7c4f4358ec9d79cda4692ce5e948c6fd409408f4c919fcadfe3
SBL SW version: 3
Firehose: prog_ufs_firehose_sm7150_ddr.elf
hash: 32b00921b7a2ea71da4a978c1e010559c79cf913, size: 678.89 KiB
oem version: c4-xm-ota-bd005.bj
qc version: BOOT.XF.3.1-00571-SM6150LZB-1
variant: SDM7150LA
Loading firehose... Done
Handshaking...
Sending ping... Done
INFO: Binary build date: Apr 7 2021 18:06:58
INFO: Chip serial num: 44699706 (0x2aa103a)
Sending configurations...
ERROR: Only nop and sig tag can be recevied before authentication.
[SERVER] Error: Undefined phone model [Xiaomi, sweet], make sure you have "MODEL" name the same as at support files !