Just for comment:
using
64-bit Ubuntu kernel 4.16.2
linux-firmware 1.173

not working...

journalctl -b | grep iwlwifi
----------------------------
kernel: iwlwifi 0000:04:00.0: hwdev DMA mask = 0x0000000fffffffff, dev_addr = 
0x00000000290ed000
kernel: iwlwifi 0000:04:00.0: swiotlb: coherent allocation failed, size=4096
kernel:  iwl_pcie_alloc_ict+0x96/0x120 [iwlwifi]
kernel:  iwl_trans_pcie_alloc+0x7f7/0xcb0 [iwlwifi]
kernel:  iwl_pci_probe+0x1d/0x1d0 [iwlwifi]
kernel:  iwl_pci_register_driver+0x24/0x40 [iwlwifi]
kernel:  iwl_drv_init+0x89/0x8b [iwlwifi]
kernel: iwlwifi: probe of 0000:04:00.0 failed with error -12

...but kernel 4.15.17 with linux-firmware 1.173 is working...

tried to add (both 4.15.17 and 4.16.2):
iwlwifi-8000C-36.ucode
iwlwifi-8265-36.ucode
...from 
https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/linux-firmware.git/plain/
...did not help... even caused a problem

also
iwlwifi-9000-pu-b0-jf-b0-38.ucode
iwlwifi-9260-th-b0-jf-b0-38.ucode
...did not help...

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https://bugs.launchpad.net/bugs/1704799

Title:
  iwlwifi: 8260: missing iwlwifi-8000C-{22..30}.ucode firmware

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