The latest firmware version can be downloaded as .apk from version.json. All devices use the same BoltApp.apk. The BoltApp gets started by another application BoltLauncher and can be found on the device at /system/priv-app/BoltLauncher/BoltLauncher.apk.
Another interesting endpoint is firmware.json (bolt, bolt2, roam).
adb install -r BoltApp.apkKnown versions of BoltLauncher are:
| Device | Code | Name | Info |
|---|---|---|---|
| ELEMNT | 63 | 1.2.0.3 | boltlauncher |
| BOLT2 | 10 | 1.0.10 | boltlauncher2 |
Enable ADB mode by pressing the power button twice, disconnect and reconnect the USB cable. RUN adb devices to see if it works. This method works on the ELEMNT, BOLT, BOLT2 and ROAM.
The .zip contains bolt-65535.cfg, comp.cfg poi.cfg and routes.cfg
# create special directory
adb shell mkdir /sdcard/config_backup
# save to pc
adb pull /sdcard/config_backup/elemnt_config.zip .# create special directory
adb shell mkdir /sdcard/config_restore
# save to pc
adb push elemnt_config.zip /sdcard/config_restore/elemnt_config.zip
# reboot device
adb shell rebootOpen Street Map is the source of the map data. MapsForge is used to generate the maps. wahooMapsCreator is a project with scripts to create maps.
Generate routing tiles with Valhalla/Mjolnir. The BOLT2 supports elevation.
I'm not sure if this is the correct way of creating a custom image. I expect something did go wrong while creating a system image, my device has around 200MB of free space with only 1 map.
#!/bin/sh
# backup.sh
for i in boot system recovery nvdata ; do
adb pull /dev/block/platform/mtk-msdc.0/by-name/$i elemnt-backup-$i.img
done
tar czf elemnt-backup.tar.gz *.imgKeep the backups somewhere safe, Wahoo does NOT provide images.
tar xzf elemnt-backup.tar.gz elemnt-backup-system.imgRecreate a system image without changing anything and flash it to make sure it works.
# create a system directory
mkdir -p system
# mount the system image
sudo mount -t ext4 -o loop elemnt-backup-system.img system/
# create new image
sudo ./android_img_repack_tools/make_ext4fs -s -l 504M -a system new-system.img system/
# umount system
sudo umount system/Now flash the image.
# create a system directory
mkdir -p system
# mount the system image
sudo mount -t ext4 -o loop elemnt-backup-system.img system/Add bolt.wahoofitness.com to the hosts file:
sudo sh -c "echo '127.0.0.1 bolt.wahoofitness.com'" >> system/etc/hostsThe default BoltApp.apk is included in the BoltLauncher.apk. To install a modified .apk later you need to resign them both. First create a keystore to resign the .apks with.
The keytool requires you to enter a password and some information (empty information works) and asks if the data is correct. Respond with
yes. Give it another password for thecertand a keystore is generated.
keytool -genkey -keystore wahoo.keystore -alias cert -keyalg RSA -keysize 2048 -validity 10000# decode BoltLauncher with apktool
apktool d -r -s system/priv-app/BoltLauncher/BoltLauncher.apk -o BoltLauncher
# remove all files from META-INF in the BoltApp.apk
zip -d BoltLauncher/assets/BoltApp.apk META-INF/CERT.RSA META-INF/CERT.SF META-INF/MANIFEST.MF
# resign BoltApp.apk
jarsigner -sigalg MD5withRSA -digestalg SHA1 -keystore wahoo.keystore BoltLauncher/assets/BoltApp.apk cert
# remove all files from META-INF in BoltLauncher
rm -fr BoltLauncher/original/META-INF/*
# rebuild BoltLauncher
apktool b BoltLauncher -o BoltLauncher.apk
# resign BoltLauncher.apk
jarsigner -sigalg MD5withRSA -digestalg SHA1 -keystore wahoo.keystore BoltLauncher.apk cert
# copy BoltLauncher back to the system image
sudo cp BoltLauncher.apk system/priv-app/BoltLauncher/BoltLauncher.apkRemove some apps from system/app (I removed Camera2, Gallery2, Calendar2, Calendar and Calculator) to make it stop complaining about no space left.
#!/bin/sh
# remove-apps.sh
for i in Camera2 Gallery2 Calendar2 Calendar Calculator; do
sudo rm -fr system/app/$i
donesudo ./android_img_repack_tools/make_ext4fs -s -l 504M -a system new-system.img system/sudo umount system/
Don't do this, this will void the warranty (bootloader) warranty: no.
Reboot the device with adb shell reboot bootloader. The screen goes blank and fastboot shoult start, test it with sudo fastboot devices. Unlock with sudo fastboot oem unlock and press the power button on the device to start unlocking. The output should be something like:
(bootloader) Start unlock flow
OKAY [ 9.707s]Check it with sudo fastboot getvar all, Unlocked: yes. Start the device with sudo fastboot continue
Run adb shell reboot bootloader and test with sudo fastboot devices.
Make sure the device is turned off, run the following script as with sudo fastboot.sh and connect the USB cable.
#!/bin/sh
# fastboot.sh
echo -n "Waiting for Elemnt"
until [ -c "/dev/ttyACM0" ]; do
echo -n "."
sleep 1
done
echo -n 'FASTBOOT' > /dev/ttyACM0
echo " Starting fastboot mode"
sleep 2
fastboot devices# start fastboot
adb shell reboot bootloader
# flash the image
sudo fastboot flash system new-system.img
# remove old stuff
sudo fastboot format cache
sudo fastboot format userdata
# boot the device
sudo fastboot continueCheck the version number and change the url.
# download BoltApp.apk
wget -O BoltApp.apk https://cdn.wahooligan.com/wahoo-fwu/elemnt/boltapp/6922/BoltApp.apk
# remove META-INF files
zip -d BoltApp.apk META-INF/CERT.RSA META-INF/CERT.SF META-INF/MANIFEST.MF
# resign BoltApp.apk
jarsigner -sigalg MD5withRSA -digestalg SHA1 -keystore wahoo.keystore BoltApp.apk cert
# copy BoltApp.apk to BoltLauncher
cp BoltApp.apk BoltLauncher/assets/BoltApp.apkRebuild the BoltLauncher, copy the BoltLauncher.apk to the system and build a new system image.
# download BoltApp.apk
wget -O BoltApp.apk https://cdn.wahooligan.com/wahoo-fwu/elemnt/boltapp/6922/BoltApp.apk
# remove META-INF files
zip -d BoltApp.apk META-INF/CERT.RSA META-INF/CERT.SF META-INF/MANIFEST.MF
# resign BoltApp.apk
jarsigner -sigalg MD5withRSA -digestalg SHA1 -keystore wahoo.keystore BoltApp.apk cert
# install with adb
adb install -r BoltApp.apk- openjdk
git clone -b android-5.1.0 https://github.com/ASdev/android_img_repack_tools
cd android_img_repack_tools
./configure
make
cd ..Thanks to Team Wahoo for making this device! :D Joshua, from the blog posts to make me decide to buy the Elemnt.