I'm on Arrow-v9.0-athene-OFFICIAL-20191104. So far I figured out this actually seems to require 32bit gapps but even those don't work. Though they can be installed, they will result in the device not booting anymore but locking up at the startup screen until battery runs out. Same for other 9.0 based ROMs on that device, strange enough.
I thought this Arrow ROM had switched back to using 32bit? So if you want to flash the latest (and last?) update, then you had to use 32bit TWRP & 32bit GApps? Older versions had been 64bits, but issues such as occasionally random reboots couldn't be quashed, so at some point (not sure when) Arrow went back to 32bits.
Thanks for the pointer. Yeah, meanwhile I found that out as well, but for whichever reasons it doesn't change things, and I'm unable to try any further (this is my wifes daily driver and I needed to in some way get it working stable again). So I'm back to an older LineageOS for now...
Did you use the TWRP that's linked in the Op? I haven't tried it myself, but my understanding is that no other TWRP (and no 64bit TWRPs) will work. But I'm not certain as I haven't tried it myself as I moved on sometime ago to a Xiaomi Redmi Note 7 (I think Moto G4 development has all but died now).
With the 2019-11-04 Arrow release I was having good results with the Gapps package (stock) released Jan 17. But earlier this morning I decided to clean flash Arrow and Gapps again in order to try the legacy Google camera and make a few other changes. This time I used the newest Jan 23 Gapps package and experienced what you described. The installation in TWRP appeared ok but the phone wouldn't boot. After another clean do-over with Jan 17 Gapps the phone booted within a few minutes and seems to be running fine again.I'm on Arrow-v9.0-athene-OFFICIAL-20191104. So far I figured out this actually seems to require 32bit gapps but even those don't work. Though they can be installed, they will result in the device not booting anymore but locking up at the startup screen until battery runs out. Same for other 9.0 based ROMs on that device, strange enough.
With the 2019-11-04 Arrow release I was having good results with the Gapps package (stock) released Jan 17. But earlier this morning I decided to clean flash Arrow and Gapps again in order to try the legacy Google camera and make a few other changes. This time I used the newest Jan 23 Gapps package and experienced what you described. The installation in TWRP appeared ok but the phone wouldn't boot. After another clean do-over with Jan 17 Gapps the phone booted within a few minutes and seems to be running fine again.
Pie ROMs in general apparently aren't booting with recent Gapps. I read somewhere on XDA about a problem with the Jan 21 package also. And there's a notice on Telegram that suggests going all the way back to October to avoid booting problems (https://t.me/s/athene_stuffs) which I doubt is necessary for most cases if my US XT1644 boots and runs ok with Jan 17 nano, mini or stock. It probably depends on architecture, locale and other differences between various models.
The recent update sof the GApps seem to has a bug that dosent allow booting in some devices. Try installing an older version and then updating the apps via playstroe later after the boot.
I posted the same question a while back after upgrading to Arrow from stock Oreo. From what I've learned, if we had LTE before we still have it as long as preferred network type is set right, except that some UIs report LTE service with the 4G symbol. It's not something that needs to be fixed, but if you really miss seeing LTE in the status bar it might be possible to hack it using adb shell.
25-6-2019: Release * Switched to 3.18 cam drivers * Merged OPJ28.111-22 cam changes, blobs * Switch to Snap * Switch to HAL1 instead of HAL3 * Update some moto frameworks * Reduce readahead to 128KiB on post-boot 23-6-2019: Bi-weekly release * Switched to lk.r13 kernel rebase (*called now as reborn) 13-6-2019: Bi-weekly release * Reworked kernel * Automatic brightness while dozing * Brightness values from potter * Restart camera services after decrypting * Xiaomi perf * Removed camera app from pinning 10-4-2019: Bi-weekly release * Fixed encryption, fm * Imported Pixelmaster camera * Imported perf stack from daisy and adapted for 8952 * PowerHAL 1.1 * Updated Sprint packages from OPJ28.111-22 * Rebased kernel, only kept needed things * Removed obsolete hwui props 15-2-2019: Bi-weekly release - Fixed statusbar padding - Moved wcnss_service into vendor and stop copying his config into data - Removed FRP prop - Removed deprecated Snap config - Give light sensor some time to warm up - Fixed some derps 02-2-2019: Bi-weekly release - Kernel patches - Added DTS:Eagle driver - Updated media codecs and profiles from OPJ28.111-12 - Updated GPS config from OPJ28.111-12 - Updated GPS blobs from deen - Imported data-ipa-cfg-mgr from CAF - Imported GPS from LA.UM.7.6.r1-02000-89xx.0 - Removed unused config 13-2-2019: Bi-weekly release - Fixed kernelpanics - Fixed audio derps - Fixed HW encryption - Re-added soundtrigger 2.0 (required by moto **** hals) - Switched to Perf stack from OPJ28.111-12 - Switched to ACDB/ADSP from OPJ28.111-12 - Enabled Verizon visual voicemail support, sustained performance mode - Disable home key if wakeup or sleep is enabled (FP actions) - Allow kernel to use 19.2MHz GPU idle freq 28-1-2019: Bi-weekly release - Enabled doze/gestures to overlay - Imported CarrierConfig from potter (phones which couldn't switch to 3-4G can now) - Moved MotoActions to Settings dashboard - Moved ppd service to hal class - Pinned camera, home apps - Removed deprecated building flags - Removed deprecated libjni_livedisplay - Removed deprecated overlay - Removed incompatible irqbal config - Removed thermal client header, HAL - Reverted soak WCNSS config - Set minimum 2 big cores - Ship Health 2.0 HAL - Some cleanup - Switched to libperfmgr - Switched to prebuilt qti-telephony-common from daisy - Updated brightness overlays with OP5T ones - Updated build fp from latest soak - Updated some core values from soak - Disabled framepointer - Improved a lot the performance - Kanged wakelock default list from lk - Removed Adreno Idler - Reverted throttling temps to default ones - Switched to wlan-driver.lnx.1.0.r30-rel driver - Updated sdfat driver to 2.1.8 - Added missing DTV permissions - Cleaned up a bit vendor - Kang ims.apk+qti-telephony-common.jar from daisy - Removed ESEPowerManager (we don't have the fw for it) - Updated CNE, QMI, RIL, PM, IMS blobs to P - Updated Perf stack from daisy (and adapted for our device) 13-1-2019: Bi-weekly release - Big vendor cleanup - Imported 64bit thermal-engine, ACBD/ADSP, EsePowerManager blobs - Imported Widevine DRM 1.0 - Imported thermal HAL - Ship Google ClearKey DRM 1.1 - Updated core_ctl to reflect changes - Boot and system dex-preopt - Fixed fp-as-lock - Applied kernel patches for CVE-2018-16658, CVE-2018-10940, CVE-2018-1000004, CVE-2017-1000410, CVE-2017-0861, CVE-2017-12153, CVE-2017-1000365, CVE-2017-7482, CVE-2017-7472, CVE-2017-6951 - Removed WifiDisplay config - Removed unused shims - Removed some sensor HALs from building - Removed deprecated HWUI config from init - Removed unused services - Removed soundtrigger HAL 9-12-2018: Weekly release - Binderize lights HAL - Binderized vendor HALs - Remove libspeakerbundle **** - Perf derps - Build fp, desc to latest nougat - Add burn-in workaround into MotoSettings - Add fp lock into MotoActions - A lot of kernel patches 1-12-2018: Weekly release - Allow CPU overclock to 1.6GHz - Allow GPU overclock to 600MHz - Allow 9v charging force back again - SDCardFS patches - Drop SafailNet - Drop libspeakerbundle - Import QTI QTEE Connector blobs from OPJ28.128 - Import QTI IOP blobs from OPJ28.128 - Import QTI Perf blobs from OPJ28.128 - Import charge_only_mode blob from OPJ28.128 - Import Audio blobs from OPJ28.128 - Import Motorola Audio Service 2.0 blobs from OPJ28.128 - Import Motorola Display Panel blobs from OPJ28.128 - Import Fingerprint blobs from OPJ28.128 - Import Motorola Power blobs from OPJ28.128 - Import esepowermanagemer blob from OPJ28.128 - Import Motorola TV blobs from evert - Import venus fw from OPJ28.128 - Import msm_irqbalance from OPJ28.128 25-11-2018: Weekly release - Fixed BT calling - Fixed FM Radio 18-11-2018: Weekly release - Fixed hotspot - Hotspot can use 5GHz now - Fixed audio policy - Removed MotoCamera - Added MotoSettings (TurboCharging on/off) - internal: qti-telephony-common built from src - internal: msm_irqbalance service added - internal: fixed vdex shared names - internal: updated power_profile to P - internal: enabled battery LED (can be disabled from Settings now) - internal: 'SafailNet' added - internal: enabled QCRIL radio power saving - internal: overlay: configure number of physical SIM slots - internal: kernel: SMBCharger Control driver added - internal: kernel: a lot of patches 02-11-2018: Spooktober release - Imported marlin brightness values - MotoCamera is included from now on - internal: gps: Missing config is now being shipped - internal: gps: Updated GPS config to P - internal: gps: GPS updated to LA.BR.1.3.7_rb1.11 - internal: overlay: Battery LED enabled on overlay (you can disable the LED while charging on Settings now) - internal: overlay: Updated power_profile to P - internal: kernel: EXFAT FS driver added - internal: kernel: Sound Control added - internal: kernel: Fingerprint as homebutton (plus configurable) added - internal: kernel: Boeffla Wakelock blocker driver added - internal: kernel: Some lower frequencies added - internal: kernel: CVE-2017-1000251 patch (critical bluetooth patch) - internal: kernel: msm8952 arm64 optimizations - internal: kernel: reduced from 2500 to 1500 mAh for turbo charging - internal: kernel: WiFi pronto driver updated to LA.BR.1.3.7_rb1.11 - internal: kernel: kCAL Colour Control v2.0 driver added 29-10-2018: Initial release - Initial release