Hi everyone, these may be of help to you. I'm not a dev so all I was doing here was using a rooted Sirocco to pull OTA files off the phone (data/ota_package). Using logcat/android bug report doesn't catch OTA URL on this device. It's my understanding they will need to be unpacked.
Files are in order of download/installation from A1N-310B-0-00WW-B03-OST604 onwards. That full firmware can be obtained here thanks to Hikari (Under Sirocco) https://hikaricalyx.com/fih-android-firmware/
The boot image for the firmware above can be found in the zip. It's already unpacked (A1N-0-310B-00WW-boot.img).
OTA 1 (Changelog - https://i.imgur.com/EeQeHyR.png)
https://mega.nz/#!SA1U3SzR!WAUtzV5AH2g6jYUYqhrUfMNh_tOe7ziNhNwZ8eZBxew
Boot image - https://mega.nz/#!2J8wBaBR!PbYVY4Ysr4l9idxReLrJe6wWu83KRy5tO29j0H2b3Ew
OTA 2 (Changelog - https://i.imgur.com/AOvs4Ps.png)
https://mega.nz/#!mB0EgCRa!oEKAxCl5iGnR3rHC91te0mgU3JgW3AXAO991kR4nj9g
Boot image - https://mega.nz/#!iU1WlKxT!mz1VrSGS987BbiPj1nvyUQzb4GEBw3686onS6ymctJI
OTA 3 (Changelog - https://i.imgur.com/nEpvMq2.png)
https://mega.nz/#!rNNAhASA!5_CdYQIym6iqc5ycN6wMqG0XvzrsCf70I3VQsy8bjFg
Boot image - https://mega.nz/#!SJt0WSxK!UkG4DbsDmUwIzExcmG1qo2xqhRk4lJlylhWHfMFJxfM
OTA 4 (Changelog - https://i.imgur.com/QH6Dnox.png)
https://mega.nz/#!HF8WlKDS!OpfBdAEUJSe_vzTebdCGg_DN_8Kzj5UZVG29x8aG6Q8
Boot image - https://mega.nz/#!7Usw1aKS!jEoZDlj5mtu5tqVpVG7XFaHLdDleiq3M6GBfy7_IUzc
OTA 5 (Changelog - https://i.imgur.com/bDSCAqX.png)
https://mega.nz/#!XUlWFKiC!_trT2aVmGQVhD-lzeZjWEn2LlmRZ4d6CMrKuAB41kkw
Boot image - https://mega.nz/#!KVl2WKqT!AcDI4YSOSo6vBe4Jb3FrOBsKGzO-KM5a8gowgNQXHog
OTA 6 (Changelog - https://i.imgur.com/ColEcRJ.png)
https://mega.nz/#!DE8QxSDQ!G1xRrjN9do28trYeQT-E9jAYmP7dszuXMKZ8kpmhcMI
Boot image - https://mega.nz/#!XB9EnY4A!UxLAX0hBabbKy09pGQz_BLQW9Hy5Lz0K4y15uVJcY7o
OTA 7 (Changelog - https://i.imgur.com/Tll0QuI.png)
https://mega.nz/#!zUsAzKLZ!TngURPA1pDUFjrmsrWvVglLmkE3GGGE4qX53-Vp38iU
Boot image - https://mega.nz/#!jck0iAjI!nEd890ZxQS1OaXX4ELNtdsIsa3TJZxddC1D7faPOB9U
OTA 8 (Changelog - https://i.imgur.com/HsZLwV4.png)
https://mega.nz/#!3dtEXQwY!CY6J3auoDeMelGSDmQiAJgOBHw3eH-sxrA3x51gXQ-U
Boot image - https://mega.nz/#!SQsUUYSD!iBwTMYd4OEDJJ7Me-zb2SnfPghc2me_ZEYR6SrdOkgU
OTA 9 (Changelog - https://i.imgur.com/eLVqDrM.png)
https://mega.nz/#!CEc1GQ7L!EiZYCubGDf5C97NNQDLZxmjcEaw555FbxHKvMNveZDw
Boot image - https://mega.nz/#!mNFzVCbD!RNTJI1_oPiHSapyykE0szjosBo_QnIoJiGZ0EQtmzqY
OTA 10 - Pie (Changelog - https://us.v-cdn.net/6031042/uploads/editor/je/y2ok3dg0norb.png)
https://mega.nz/#!fYUAgQJY!p6kO-B-IFwz0NhDv4ZlrDCQYKQGakH3fy9GbfG_kmDM
Boot image - https://mega.nz/#!qANy1a7b!ODh8ol97h8qJwZGndUCHqyG3qifnsfT7ILkggDaVoFA
Magisk patched boot - https://mega.nz/#!HYVimArR!m7BHM2iYVZVstTFx0W-zB01cSN-bb4lquKiYUmXoIm4
Files are in order of download/installation from A1N-310B-0-00WW-B03-OST604 onwards. That full firmware can be obtained here thanks to Hikari (Under Sirocco) https://hikaricalyx.com/fih-android-firmware/
The boot image for the firmware above can be found in the zip. It's already unpacked (A1N-0-310B-00WW-boot.img).
OTA 1 (Changelog - https://i.imgur.com/EeQeHyR.png)
https://mega.nz/#!SA1U3SzR!WAUtzV5AH2g6jYUYqhrUfMNh_tOe7ziNhNwZ8eZBxew
Boot image - https://mega.nz/#!2J8wBaBR!PbYVY4Ysr4l9idxReLrJe6wWu83KRy5tO29j0H2b3Ew
OTA 2 (Changelog - https://i.imgur.com/AOvs4Ps.png)
https://mega.nz/#!mB0EgCRa!oEKAxCl5iGnR3rHC91te0mgU3JgW3AXAO991kR4nj9g
Boot image - https://mega.nz/#!iU1WlKxT!mz1VrSGS987BbiPj1nvyUQzb4GEBw3686onS6ymctJI
OTA 3 (Changelog - https://i.imgur.com/nEpvMq2.png)
https://mega.nz/#!rNNAhASA!5_CdYQIym6iqc5ycN6wMqG0XvzrsCf70I3VQsy8bjFg
Boot image - https://mega.nz/#!SJt0WSxK!UkG4DbsDmUwIzExcmG1qo2xqhRk4lJlylhWHfMFJxfM
OTA 4 (Changelog - https://i.imgur.com/QH6Dnox.png)
https://mega.nz/#!HF8WlKDS!OpfBdAEUJSe_vzTebdCGg_DN_8Kzj5UZVG29x8aG6Q8
Boot image - https://mega.nz/#!7Usw1aKS!jEoZDlj5mtu5tqVpVG7XFaHLdDleiq3M6GBfy7_IUzc
OTA 5 (Changelog - https://i.imgur.com/bDSCAqX.png)
https://mega.nz/#!XUlWFKiC!_trT2aVmGQVhD-lzeZjWEn2LlmRZ4d6CMrKuAB41kkw
Boot image - https://mega.nz/#!KVl2WKqT!AcDI4YSOSo6vBe4Jb3FrOBsKGzO-KM5a8gowgNQXHog
OTA 6 (Changelog - https://i.imgur.com/ColEcRJ.png)
https://mega.nz/#!DE8QxSDQ!G1xRrjN9do28trYeQT-E9jAYmP7dszuXMKZ8kpmhcMI
Boot image - https://mega.nz/#!XB9EnY4A!UxLAX0hBabbKy09pGQz_BLQW9Hy5Lz0K4y15uVJcY7o
OTA 7 (Changelog - https://i.imgur.com/Tll0QuI.png)
https://mega.nz/#!zUsAzKLZ!TngURPA1pDUFjrmsrWvVglLmkE3GGGE4qX53-Vp38iU
Boot image - https://mega.nz/#!jck0iAjI!nEd890ZxQS1OaXX4ELNtdsIsa3TJZxddC1D7faPOB9U
OTA 8 (Changelog - https://i.imgur.com/HsZLwV4.png)
https://mega.nz/#!3dtEXQwY!CY6J3auoDeMelGSDmQiAJgOBHw3eH-sxrA3x51gXQ-U
Boot image - https://mega.nz/#!SQsUUYSD!iBwTMYd4OEDJJ7Me-zb2SnfPghc2me_ZEYR6SrdOkgU
OTA 9 (Changelog - https://i.imgur.com/eLVqDrM.png)
https://mega.nz/#!CEc1GQ7L!EiZYCubGDf5C97NNQDLZxmjcEaw555FbxHKvMNveZDw
Boot image - https://mega.nz/#!mNFzVCbD!RNTJI1_oPiHSapyykE0szjosBo_QnIoJiGZ0EQtmzqY
OTA 10 - Pie (Changelog - https://us.v-cdn.net/6031042/uploads/editor/je/y2ok3dg0norb.png)
https://mega.nz/#!fYUAgQJY!p6kO-B-IFwz0NhDv4ZlrDCQYKQGakH3fy9GbfG_kmDM
Boot image - https://mega.nz/#!qANy1a7b!ODh8ol97h8qJwZGndUCHqyG3qifnsfT7ILkggDaVoFA
Magisk patched boot - https://mega.nz/#!HYVimArR!m7BHM2iYVZVstTFx0W-zB01cSN-bb4lquKiYUmXoIm4
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