diff --git a/README.md b/README.md
index ea3bbc9..357727b 100644
--- a/README.md
+++ b/README.md
@@ -20,3 +20,13 @@ See the <a href="https://raw.githubusercontent.com/jvaubourg/hotspot_ynh/master/
 * Automatic clients configuration (IPv6 with SLAAC/DHCPv6 and IPv4 with DHCPv4)
 * Set an IPv6 from your delegated prefix (*prefix::42*) on the server, to use for the AAAA records
 * Web interface ([screenshot](https://raw.githubusercontent.com/jvaubourg/hotspot_ynh/master/screenshot.png))
+
+## Prerequisites
+
+This app works with a non-stable version of YunoHost.
+
+Until this version is available (coming soon!) as an official stable release, you need to execute some commands before installing this app:
+
+    # service bind9 stop
+    # update-rc.d bind9 remove
+    # apt-get install dnsmasq
diff --git a/conf/firmware_htc-7010.fw b/conf/firmware_htc-7010.fw
new file mode 100644
index 0000000..9d72121
Binary files /dev/null and b/conf/firmware_htc-7010.fw differ
diff --git a/conf/firmware_htc-9271.fw b/conf/firmware_htc-9271.fw
new file mode 100644
index 0000000..e02f6c3
Binary files /dev/null and b/conf/firmware_htc-9271.fw differ
diff --git a/scripts/install b/scripts/install
index 3994895..61db479 100644
--- a/scripts/install
+++ b/scripts/install
@@ -146,6 +146,12 @@ sudo install -b -o root -g root -m 0644 ../conf/dnsmasq_dhcpdv4.conf.tpl /etc/dn
 sudo install -b -o root -g root -m 0644 ../conf/nginx_wifiadmin.conf "/etc/nginx/conf.d/${domain}.d/wifiadmin.conf"
 sudo install -b -o root -g root -m 0644 ../conf/phpfpm_wifiadmin.conf /etc/php5/fpm/pool.d/wifiadmin.conf
 
+# Copy (free) firmwares
+# Extract from http://packages.trisquel.info/toutatis-updates/open-ath9k-htc-firmware
+# https://www.fsf.org/news/ryf-certification-thinkpenguin-usb-with-atheros-chip
+sudo install -b -o root -g root -m 0644 ../conf/firmware_htc-7010.fw /lib/firmware/htc-7010.fw
+sudo install -b -o root -g root -m 0644 ../conf/firmware_htc-9271.fw /lib/firmware/htc-9271.fw
+
 # Copy web sources
 sudo mkdir -pm 0755 /var/www/wifiadmin/
 sudo cp -a ../sources/* /var/www/wifiadmin/
diff --git a/scripts/remove b/scripts/remove
index febcd6b..890b24a 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -36,6 +36,10 @@ sudo rm -f /etc/hostapd/hostapd.conf{.tpl,} /etc/radvd.conf{.tpl,} /etc/dhcp/dhc
 sudo rm -f /etc/nginx/conf.d/${domain}.d/wifiadmin.conf
 sudo rm -f /etc/php5/fpm/pool.d/wifiadmin.conf
 
+# Remove firmwares
+sudo rm -f /lib/firmware/htc-7010.fw
+sudo rm -f /lib/firmware/htc-9271.fw
+
 # Restart services
 sudo yunohost service stop php5-fpm
 sudo yunohost service start php5-fpm