Htc A9 stock Nougat ROM please
 

(bootloader) kernel: lk
(bootloader) product: htc_hiaeuhl
(bootloader) version: 1.0
(bootloader) version-main: 1.62.161.2
(bootloader) boot-mode: download
(bootloader) version-baseband: 1.1.U00036.1@60204
(bootloader) version-bootloader: 1.0.0.0000
(bootloader) mid: 2PQ910000
(bootloader) cid: 11111111

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Much appreciated

Here you can get the firmware for your phone for free and with direct link

HTC Stock Firmware Database by HardReset.info Team

Firmware name for your phone is:
2PQ9IMG HIA AERO UHL N70 SENSE80GP MR HTC Europe 2.17.401.2 Radio 1.1.U40062.1@61209 60.00 F

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash zip 2PQ9IMG_HIA_AERO_UHL_N70_SENSE80GP_M...signed_2_4.zip
target reported max download size of 800000000 bytes
Invalid sparse file format at header magic
error: write_sparse_skip_chunk: don't care size 985720224 is not a multiple of the block size 4096
error: write_sparse_skip_chunk: don't care size 185722272 is not a multiple of the block size 4096
sending sparse 'zip' 1/3 (781248 KB)...
error: write_sparse_skip_chunk: don't care size 985720224 is not a multiple of the block size 4096
error: write_sparse_skip_chunk: don't care size 985720224 is not a multiple of the block size 4096
OKAY [ 33.942s]
writing 'zip' 1/3...
(bootloader) HOSD CL#722052
(bootloader) ERR lzipv2_init : Cannot open file /dev/fastboot_download_Q
(bootloader) xorO1
(bootloader) ERR [SD_UPDATE_ERR] update_fb_ZIP_buf: can not find ZIP hea
(bootloader) der
(bootloader) ERR [SD_UPDATE_ERR] sddownload failed: 22
(bootloader) ERR Update zip file failed.
(bootloader) ERR ZIP ERROR, exit read zip loop
(bootloader) Update zip file OK
(bootloader) ERR ZIP ERROR CODE, 22
(bootloader) end@Done
FAILED (remote: 22 RU_HEADER_ERROR )
finished. total time: 36.053s

I have also just tried sdcard method.
error:

12 RU_ZIP_ERROR
12 RU_ZIP_ERROR
FAIL12 RU_ZIP_ERROR

Try download again and try again if not help will check on my source file and if can will upload working one.
Sorry but can't check all HTC firmware that I download for users on this forum.