diff --git a/roles/calibre/tasks/debs.yml b/roles/calibre/tasks/debs.yml
index 0d13d9b9d..43566b8fb 100644
--- a/roles/calibre/tasks/debs.yml
+++ b/roles/calibre/tasks/debs.yml
@@ -28,7 +28,8 @@
 #  when: is_rpi and internet_available
 
 - name: Upgrade to latest Calibre using .deb's from testing (rpi)
-  command: scripts/calibre-install-latest-rpi.sh    # SEEMS TO ONCE AGAIN WORK since Calibre 3.26.0 (Calibre 3.24-3.25 required above prereq calibre-install-packages.sh then Debian's own calibre-install-latest.sh to be bootable in Zero W)
+  command: scripts/calibre-install-latest-rpi-plus.sh    # HOPE IT WORKS FOR Calibre 3.27.1+ starting 2018-07-22 -- PLEASE TEST IF BOOTABLE IN Zero W?
+  #command: scripts/calibre-install-latest-rpi.sh    # WORKED FOR Calibre 3.26.x (Calibre 3.24.x & 3.25 required above prereq calibre-install-packages.sh then Debian's own calibre-install-latest.sh to be bootable in Zero W)
   when: is_rpi and internet_available
 
 - name: Upgrade to Calibre testing .deb's - target Ubuntu 16.04 (not rpi and not ubuntu_18)
diff --git a/scripts/calibre-install-latest-rpi-plus.sh b/scripts/calibre-install-latest-rpi-plus.sh
new file mode 100755
index 000000000..cf9d5114c
--- /dev/null
+++ b/scripts/calibre-install-latest-rpi-plus.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Calibre 3.27.1 .deb's were released for Raspbian 2018-07-22 but requires
+# python-pyqt5 from debian testing, to overcome error:
+#
+#    The following packages have unmet dependencies:
+#    calibre : Depends: python-pyqt5 (>= 5.11.2+dfsg-1) but 5.10.1+dfsg-2+rpi1 is to be installed
+#
+# More details @ https://github.com/iiab/iiab/issues/948 and
+# https://www.mobileread.com/forums/showthread.php?p=3729117#post3729117
+
+# Thanks to Jerry Vonau (https://github.com/jvonau) who made this critical
+# breakthrough possible!
+#
+# SEE COMMENTS AT THE TOP OF scripts/calibre-install-packages.sh
+
+export DEBIAN_FRONTEND=noninteractive
+
+# Prepares to update from debian testing
+apt-key adv --recv-key --keyserver keyserver.ubuntu.com 7638D0442B90D010
+echo "deb http://deb.debian.org/debian testing main" >> /etc/apt/sources.list.d/debian-testing.list
+apt update
+apt -y install python-pyqt5
+rm /etc/apt/sources.list.d/debian-testing.list
+
+# Prepares to update from raspbian testing
+echo "deb http://raspbian.raspberrypi.org/raspbian/ testing main" > /etc/apt/sources.list.d/rpi-testing.list
+apt update
+apt -y install calibre calibre-bin
+rm /etc/apt/sources.list.d/rpi-testing.list
+# Clears the cache of testing
+apt update
diff --git a/scripts/calibre-install-latest-rpi.sh b/scripts/calibre-install-latest-rpi.sh
index 092cbb00c..869a4b64f 100755
--- a/scripts/calibre-install-latest-rpi.sh
+++ b/scripts/calibre-install-latest-rpi.sh
@@ -6,11 +6,12 @@
 # SEE COMMENTS AT THE TOP OF scripts/calibre-install-packages.sh
 
 export DEBIAN_FRONTEND=noninteractive
-# Prepares to update to latest from testing
+# Prepares to update to latest from raspbian testing
 echo "deb http://raspbian.raspberrypi.org/raspbian/ testing main" > /etc/apt/sources.list.d/rpi-testing.list
 apt update
 apt -y install calibre calibre-bin
-# Removes last line, safer than: rm /etc/apt/sources.list.d/rpi-testing.list
-sed -i '$ d' /etc/apt/sources.list.d/rpi-testing.list
+## Removes last line, safer than: rm /etc/apt/sources.list.d/rpi-testing.list
+#sed -i '$ d' /etc/apt/sources.list.d/rpi-testing.list
+rm /etc/apt/sources.list.d/rpi-testing.list
 # Clears the cache of testing
 apt update
diff --git a/scripts/calibre-install-latest.sh b/scripts/calibre-install-latest.sh
index 75142a5c2..c8bf11ebd 100755
--- a/scripts/calibre-install-latest.sh
+++ b/scripts/calibre-install-latest.sh
@@ -8,12 +8,13 @@
 export DEBIAN_FRONTEND=noninteractive
 # Drags in stock desktop dependencies without too much from testing below
 apt -y install dirmngr
-# Prepares to update to latest from testing
+# Prepares to update to latest from debian testing
 apt-key adv --recv-key --keyserver keyserver.ubuntu.com 7638D0442B90D010
 echo "deb http://deb.debian.org/debian testing main" >> /etc/apt/sources.list.d/debian-testing.list
 apt update
 apt -y install libqt5core5a python-lxml calibre calibre-bin
-# Removes last line, safer than: rm /etc/apt/sources.list.d/debian-testing.list
-sed -i '$ d' /etc/apt/sources.list.d/debian-testing.list
+## Removes last line, safer than: rm /etc/apt/sources.list.d/debian-testing.list
+#sed -i '$ d' /etc/apt/sources.list.d/debian-testing.list
+rm /etc/apt/sources.list.d/debian-testing.list
 # Clears the cache of testing
 apt update