grub not showing windows 10

Windows 10 isn't showing up in the grub menu eventhough windows bios mode is uefi

System:
  Kernel: 5.4.23-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.2.1 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.4-x86_64 
  root=UUID=5b6098ea-bacc-49e7-953d-0f4a8564cbb4 rw quiet apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: Gnome 3.34.4 wm: gnome-shell dm: GDM 3.34.1 Distro: Manjaro Linux 
Machine:
  Type: Laptop System: HP product: HP 250 G7 Notebook PC 
  v: Type1ProductConfigId serial: <filter> Chassis: type: 10 
  serial: <filter> 
  Mobo: HP model: 8533 v: 70.31 serial: <filter> UEFI [Legacy]: Insyde 
  v: F.20 date: 06/28/2019 
Battery:
  ID-1: BAT1 charge: 39.8 Wh condition: 41.7/41.0 Wh (102%) volts: 12.5/11.4 
  model: Hewlett-Packard PABAS0241231 type: Li-ion serial: <filter> 
  status: Discharging 
CPU:
  Topology: Quad Core model: Intel Core i5-8265U bits: 64 type: MT MCP 
  arch: Kaby Lake family: 6 model-id: 8E (142) stepping: C (12) 
  microcode: CA L2 cache: 6144 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 28808 
  Speed: 800 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 800 2: 800 
  3: 800 4: 800 5: 800 6: 801 7: 800 8: 800 
  Vulnerabilities: Type: itlb_multihit status: KVM: Split huge pages 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel UHD Graphics 620 vendor: Hewlett-Packard driver: i915 
  v: kernel bus ID: 00:02.0 chip ID: 8086:3ea0 
  Device-2: NVIDIA GM108M [GeForce MX110] vendor: Hewlett-Packard 
  driver: nvidia v: 440.59 bus ID: 01:00.0 chip ID: 10de:174e 
  Display: x11 server: X.Org 1.20.7 driver: modesetting,nvidia 
  alternate: fbdev,intel,nouveau,nv,vesa compositor: gnome-shell 
  resolution: 1920x1080~60Hz 
  OpenGL: renderer: Mesa DRI Intel UHD Graphics (Whiskey Lake 3x8 GT2) 
  v: 4.6 Mesa 19.3.4 compat-v: 3.0 direct render: Yes 
Audio:
  Device-1: Intel Cannon Point-LP High Definition Audio 
  vendor: Hewlett-Packard driver: snd_hda_intel v: kernel bus ID: 00:1f.3 
  chip ID: 8086:9dc8 
  Sound Server: ALSA v: k5.4.23-1-MANJARO 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: Hewlett-Packard driver: r8169 v: kernel port: 4000 bus ID: 02:00.0 
  chip ID: 10ec:8168 
  IF: eno1 state: down mac: <filter> 
  Device-2: Realtek RTL8821CE 802.11ac PCIe Wireless Network Adapter 
  vendor: Hewlett-Packard driver: rtl8821ce v: N/A port: 3000 
  bus ID: 03:00.0 chip ID: 10ec:c821 
  IF: wlo1 state: up mac: <filter> 
Drives:
  Local Storage: total: 931.51 GiB used: 10.85 GiB (1.2%) 
  ID-1: /dev/sda vendor: Seagate model: ST1000LM035-1RK172 size: 931.51 GiB 
  block size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: RTM2 scheme: GPT 
RAID:
  Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci 
  v: 3.0 port: 6060 bus ID: 00:17.0 chip ID: 8086.282a rev: 30 
Partition:
  ID-1: / raw size: 68.36 GiB size: 66.79 GiB (97.70%) 
  used: 10.85 GiB (16.2%) fs: ext4 dev: /dev/sda6 
Sensors:
  System Temperatures: cpu: 37.0 C mobo: 29.8 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 235 Uptime: 3m Memory: 7.67 GiB used: 847.4 MiB (10.8%) 
  Init: systemd v: 242 Compilers: gcc: 9.2.1 Shell: bash v: 5.0.16 
  running in: gnome-terminal inxi: 3.0.37 
 

sudo update-grub

Probably...

Works only if Manjaro is uefi

Oh, right. Assumptions and all that...

If Manjaro is installed in bios mode you'll have to either reinstall in uefi mode or keep things the way they are and boot windows from the bios/boot menu.

If Manjaro and Windows are both installed as uefi then see my first post.

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https://wiki.manjaro.org/index.php/Restore_the_GRUB_Bootloader

I'm pretty sure this comes up once every day...

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if you get to the point where you don't mind losing your files, you could try reinstalling windows 10, I understand that manjaro starts correctly, you would have to enable AUR packages in pacman, compile and install WoeUsb, download windows 10 from its official website, and at create the bootable usb uses the option of formatting usb in NTFS for UEFI (GPT), the option formatting usb in fat32 works for me only for BIOS LEGACY (MBR).

inxi output indicates Manjaro is booted in UEFI mode.

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